Terrorism
Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. In 2006, one estimate counted over 109 different definitions of the word. A Harvard law professor named Richard Baxter, an expert on the law of war, was blunt about the problem. He wrote that there was cause to regret a legal concept of terrorism was ever inflicted on us, calling the term imprecise, ambiguous, and of no operative legal purpose. How does a single word resist definition for so long? Who decides when violence becomes terrorism, and when it becomes something governments would rather call by another name? This script follows the term from a revolutionary courtroom to a global database of more than 61,000 incidents, and asks why one person's terrorist remains another person's freedom fighter.
Maximilien Robespierre, leader of the Jacobin Club, declared that terror is nothing other than justice, prompt, severe, inflexible. The word terrorism itself first described the actions of his club during the Reign of Terror in the French Revolution. In 1795, Edmund Burke denounced the Jacobins for letting thousands of those hell-hounds called Terrorists loose on the people of France. The label was an accusation from the start. John Calvin's rule over Geneva in the 16th century has also been described as a reign of terror, stretching the idea backward. The terms regained currency in the 1970s, attached to groups including the Palestine Liberation Organization, the Irish Republican Army, the Basque separatist group ETA, and the Red Army Faction. Leila Khaled was described as a terrorist in a 1970 issue of Life magazine, and a number of books on the subject appeared that decade. The topic came further forward after the 1983 Beirut barracks bombings, then again after the 2001 September 11 attacks and the 2002 Bali bombings.
Title 18 of the United States Code, section 2331, defines terrorism as acts intended to intimidate or coerce civilians, to influence government policy by coercion, or to affect the conduct of a government by mass destruction, assassination, or kidnapping. Yet no definition has gained universal agreement. The trouble runs deeper than wording. Counterterrorism analyst Bruce Hoffman observed that it is not only agencies within the same government that cannot agree on one definition; long-established scholars are equally incapable of reaching consensus. In 1992, terrorism studies scholar Alex P. Schmid proposed a simple formulation to a United Nations commission, calling such acts peacetime equivalents of war crimes, but it was not accepted. The international community has been slow to formulate a universally agreed, legally binding definition. It could not conclude a Comprehensive Convention on International Terrorism. Instead it adopted a series of sectoral conventions that criminalize specific activities, such as homicide, rather than terrorism as a single cohesive offense. The Chairman of the United Nations Counter-Terrorism Committee later noted that of twelve international conventions on the subject, none referred to state terrorism, which he said was not an international legal concept.
David C. Rapoport published his article Fear and Trembling: Terrorism in Three Religious Traditions in 1984, and the field shifted beneath it. Before that, early studies like Paul Wilkinson's treated terrorism as a product of 19th-century revolutionary politics, made possible by the pistol and dynamite. Rapoport proposed three case studies to argue for an ancient lineage of what he called sacred terror: the Thugs, the Order of Assassins, and the Jewish Sicarii Zealots. He was the first to propose that religious doctrines mattered more than political rationales for some groups. His work became the basis of a model called New Terrorism, developed by Bruce Hoffman. Hoffman argued that religious terrorists carry out indiscriminate violence as a divine duty, with no consideration for political efficacy, their aim transcendental. Critics have called the model politically charged and over-simplified. The Oxford Handbook on the History of Terrorism noted that authors tend to crudely paraphrase Rapoport, taking the relevance of Thuggee to modern terrorism for granted in lieu of empirical research.
The Irish Republican Brotherhood, founded in 1858 as a revolutionary Irish nationalist group, has been called the first organization to use modern terrorist techniques. It carried out attacks in England. In 1881 it began the Fenian dynamite campaign, using timed explosives to sow fear in the heart of metropolitan Britain rather than relying on political assassination. In Russia, Narodnaya Volya was founded in 1878, a revolutionary anarchist group inspired by Sergei Nechayev and the propaganda-by-the-deed theorist Carlo Pisacane. They were the first anarchist group to make widespread use of dynamite, convinced the new technology let them strike directly and with discrimination. In France, state repression of anarchists led to the Ere des attentats from 1892 to 1894. Following Ravachol's bombings, terrorism shifted from being person-based to location-based, beginning with the Saint-Germain bombing. Three incidents months apart laid the foundation for mass terrorism: the Liceu bombing, the stabbing of the 13th of November 1893, and the Cafe Terminus attack. Emile Henry, responsible for the Cafe Terminus bombing, claimed the birth of this new form, saying he wanted to strike at random.
In 1980, by Bruce Hoffman's count, 2 out of 64 terrorist groups were categorized as religiously motivated. By 1995, almost half, 26 out of 56, were, the majority guided by Islam. The Global Terrorism Index, from the University of Maryland, College Park, reports that religious extremism has overtaken national separatism as the main driver of attacks worldwide. Before 2000, nationalist separatist organizations such as the IRA and Chechen rebels were behind the most attacks. Their numbers stayed relatively stable while religious extremism grew, driven by Islamist groups in Iraq, Afghanistan, Pakistan, Nigeria, and Syria. Hamas, the main Islamist movement in the Palestinian territories, was formed by Palestinian Imam Ahmed Yassin in 1987. In the periods of 1994 to 1996 and 2001 to 2007, it carried out suicide bombings that killed over 1,000 Israeli civilians. In 2013, eighty percent of all deaths from terrorism occurred in five countries. Yet the danger is not only Islamist. A 2015 report titled The Age of the Wolf analysed 62 incidents and found that between 2009 and 2015, more people were killed in America by non-Islamic domestic terrorists than by jihadists.
Ariel Merari, a psychologist who has studied suicide terrorists since 1983, concluded they were unlikely to be psychologically abnormal. The careful planning seen in many attacks is not a trait of mentally unstable people. A 2007 study by economist Alan B. Krueger found terrorists less likely to come from impoverished backgrounds, 28 percent versus 33 percent, and more likely to have at least a high-school education. Scott Atran found that suicide terrorists show none of the socially dysfunctional traits one might expect; they do not act out of hopelessness. Researchers Paul Gill, John Horgan, and Paige Deckert profiled lone wolf attackers and found 43 percent motivated by religious beliefs, 32 percent with pre-existing mental health disorders, and 40 percent unemployed at the time of arrest or event. Abrahm suggests groups do not select terrorism for its political effectiveness, and that individuals are motivated more by social solidarity with fellow members than by murky strategic objectives. The majority of attacks are carried out by military-age men, aged 16 to 40, who look and behave normally until executing the mission.
Vera Zasulich attacked a Russian official known for abusing prisoners, then told the court, I am not a criminal, I am a terrorist. The stunned court acquitted her, realizing she was trying to become a martyr, and she was carried out on the shoulders of the crowd. Margaret Thatcher called publicity the oxygen of terrorism, and the word itself has become a weapon. Bruce Hoffman, in Inside Terrorism, noted that everyone agrees on one point: terrorism is a pejorative term applied to one's enemies. The aphorism runs that one man's terrorist is another man's freedom fighter. Professor Martin Rudner called that grossly misleading, arguing it judges the cause when terrorism is an act; one can have a beautiful cause and still commit terrorism. Nobel Peace Prize laureates Menachem Begin and Nelson Mandela were once called terrorists, then statesmen. The Zionist group Lohamei Herut Yisrael admitted using terrorist tactics while calling itself Freedom Fighters for Israel. Audrey Kurth Cronin, in How Terrorism Ends, listed six ways groups finish, among them decapitation, negotiation, success, and repression. Kazakhstan's President Nursultan Nazarbayev initiated a Code of Conduct, adopted by the United Nations in 2018 and signed by more than 70 countries, aiming for a world free of terrorism by 2045.
Continue Browsing
Common questions
What is the definition of terrorism?
Terrorism, in its broadest sense, is the use of violence against non-combatants to achieve political or ideological aims. No definition has gained universal agreement, and in 2006 one estimate counted over 109 different definitions.
Where did the word terrorism come from?
The word terrorism was originally used to describe the actions of the Jacobin Club during the Reign of Terror in the French Revolution. In 1795, Edmund Burke denounced the Jacobins for letting thousands of those hell-hounds called Terrorists loose on the people of France.
How many terrorist incidents has the Global Terrorism Database recorded?
The Global Terrorism Database, maintained by the University of Maryland, College Park, has recorded more than 61,000 incidents of non-state terrorism. These resulted in at least 140,000 deaths between 2000 and 2014.
What was the first modern terrorist organization?
The Irish Republican Brotherhood, founded in 1858 as a revolutionary Irish nationalist group, has been called the first organization to use modern terrorist techniques. It began the Fenian dynamite campaign in 1881, using timed explosives to sow fear in metropolitan Britain.
Why is the term terrorism so hard to define?
The term terrorism is politically and emotionally charged, with double standards used in applying it and disagreement over the limits of the right to self-determination. Counterterrorism analyst Bruce Hoffman noted that even long-established scholars cannot reach consensus on a single definition.
Who are most terrorist attacks carried out by?
The majority of terrorist attacks are carried out by military-age men, aged 16 to 40. A 2007 study by economist Alan B. Krueger found terrorists were less likely to come from impoverished backgrounds and more likely to have at least a high-school education.
How do terrorist groups usually end?
In How Terrorism Ends (2009), Audrey Kurth Cronin lists six primary ways: capture or killing of a leader, entry into a legitimate political process, achievement of aims, group implosion, defeat by brute force, and transition into other forms of violence. Jones and Libicki found that of groups that ended, 43 percent converted to nonviolent political action and 40 percent were defeated by law enforcement.
All sources
191 references cited across the entry
- 1BookGlobal Alert: The Rationality of Modern Islamist Terrorism and the Challenge to the Liberal Democratic WorldBoaz Ganor — Columbia University Press — 2015
- 2BookTorture, Terrorism, and the Use of Violence (also available as Review Journal of Political Philosophy Volume 6, Issue Number 1)Cambridge Scholars Publishing — 2008
- 4BookThe corporate security professional's handbook on terrorismEdward P. Halibozek et al. — Elsevier (Butterworth-Heinemann) — 2008
- 5NewsCan Soldiers Be Victims of Terrorism?Robert Mackey — November 20, 2009
- 6BookOxford dictionary of EnglishOxford University Press — 2010
- 7Global Terrorism Index 2015Institute for Economics and Peace
- 9BookUnderstanding TerrorismGus Martin — SAGE Publications — 2010
- 10BookState Terrorism and Neoliberalism: The North in the SouthR. Blakeley — Routledge — 2009
- 11JournalOne-Sided Violence Against Civilians in WarK. Eck et al. — 2007
- 12BookAtrocities: The 100 Deadliest Episodes in Human HistoryM. White — W. W. Norton & Company — 2013
- 13BookTHE NINTH OF THERMIDOR THE FALL OF ROBESPIERRERichard Bienvenu — Oxford University Press — January 1, 1968
- 14BookSober, Strict, and Scriptural: Collective Memories of John Calvin, 1800–2000J. de Niet et al. — Brill — 2009
- 15BookHistory of Switzerland, 1499–1914W. Oechsli et al. — The University Press — 1922
- 16BookThe Continental Legal History SeriesAssociation of American Law Schools — Little, Brown, & Company — 1916
- 17BookThe Politics of TerrorismIlan Peleg — CRC Press — 1988
- 18BookTerrorism in ContextMartha Crenshaw — Penn State Press — 2010
- 19BookTerrorism in ContextGoldie Shabad et al. — Penn State Press — 2010
- 20BookThe Politics of TerrorismRaymond R. Corrado et al. — CRC Press — January 29, 1988
- 21NewsThis is Your New Captain SpeakingLeila Khaled — September 18, 1970
- 23BookState Terrorism and Political Identity in Indonesia: Fatally BelongingAriel Heryanto — Routledge — April 7, 2006
- 24BookSocio-Cultural Construction of Recognition: The Discursive Representation of Islam and Muslims in the British Christian News MediaGabriel Faimau — Cambridge Scholars Publishing — July 26, 2013
- 25BookEncyclopedia of IslamJuan Eduardo Campo — Infobase Publishing — January 1, 2009
- 26BookThe Routledge Handbook of Terrorism ResearchSchmid, Alex P. — Routledge — 2011
- 27The Cambridge History of TerrorismMartyn Frampton — Cambridge University Press — 2021
- 31BookInternational and Transnational Criminal LawAspen Publishing — 2010
- 33NewsRadicalisation, De-Radicalisation, Counter-Radicalisation: A Conceptual Discussion and Literature ReviewThe International Centre for Counter-Terrorism – The Hague (ICCT) — March 27, 2013
- 35BookThe Cambridge Handbook of the Psychology of Violent ExtremismAlex P. Schmid — Cambridge University Press — 2025-08-07
- 36BookCriminologyLarry Siegel — Cengage Learning — January 2, 2008
- 37JournalDiscussion 1 – Revisiting the wicked problem of defining terrorismAlex P. Schmid — October 7, 2020
- 38BookEncyclopedia of Law and SocietyDavid S. Clark — Sage — 2007
- 39Laqueur (2001)Laqueur — 2001
- 41BookThe Dynamiters: Irish Nationalism and Political Violence in the Wider World 1867–1900Niall Whelehan — Cambridge University Press — 2012
- 44A Brief History of TerrorismMark Burgess — July 2, 2003
- 46The Changing Faces of TerrorismAdam Roberts — September 18, 2014
- 47BookThe Battle against Anarchist TerrorismCambridge University Press — December 5, 2013
- 48BookCountering the New TerrorismBruce Hoffman — Rand Corporation — 1999
- 49The Evolution of Islamic Terrorism: an OverviewJohn Moore — PBS Frontline
- 50TE-SAT 2011 EU Terrorism Situation and Trend ReportEuropol — 2011
- 51TE-SAT 2010 Terrorism Situation and Trend ReportEuropol — 2010
- 52TE-SAT 2009 Terrorism Situation and Trend ReportEuropol — 2009
- 53Disorders and Terrorism1976
- 54NewsWhy do terrorists claim credit for some attacks but not others?February 1, 2019
- 55TERRORISMEarth Dashboard
- 56BookTerrorism and homeland security: an introduction with applicationsPhilip P. Purpura — Butterworth-Heinemann — 2007
- 58BookHandbook of Emergency Management Concepts: A Step-by-Step ApproachMichael L. Madigan — CRC Press — December 6, 2017
- 59Journal'Faced with death, even a mouse bites': Social and religious motivations behind terrorism in ChechnyaMatthew Janeczko — June 19, 2014
- 60JournalBombing Alone: Tracing the Motivations and Antecedent Behaviors of Lone-Actor TerroristsPaul Gill et al. — March 1, 2014
- 61Book"Psychological Aspects of Suicide Terrorism," in Bruce Bongar et al., Psychology of Terrorism.Ariel Merari — Oxford University Press — 2006
- 62JournalMishandling Suicide TerrorismScott Atran — 2004
- 63JournalWhat Terrorists Really Want: Terrorist Motives and Counterterrorism StrategyMax Abrahms — March 2008
- 64JournalMarket Civilization and its Clash with TerrorMichael Mousseau — 2002
- 66NewsReligious extremism main cause of terrorism, according to reportGeorge Arnett — November 19, 2014
- 67BookIncitement to TerrorismAnne F. Bayefsky et al. — BRILL — March 22, 2018
- 68JournalAntisemitism and Hate Speech StudiesAlexander Tsesis — 2014–2015
- 69Understanding Hamas's Genocidal IdeologyBruce Hoffman — October 10, 2023
- 70Journal"Martyrdom is Life": Jihad and Martyrdom in the Ideology of HamasMeir Litvak — July 15, 2010
- 71BookGlobal Terrorism Index 2016Institute for Economics and Peace — 2016
- 72Isis: a contrived ideology justifying barbarism and sexual controlMona Siddiqui — August 23, 2014
- 75NewsFatwa issued against suicide bombings, targeted killings and terrorismJuly 2, 2013
- 76ReportAge of the WolfRyan Lenz — Southern Poverty Law Center — February 2015
- 79NewsFull Text of Eric Rudolph's ConfessionApril 14, 2005
- 80NewsSteered to Extremism at an Early AgeFrank Ahrens — June 1, 2003
- 85NewsBasque Terrorist Group Marks 50th Anniversary with New AttacksJuly 31, 2009
- 87NewsShining PathSimon Romero — March 18, 2009
- 88News1983: Car bomb in South Africa kills 16BBC — May 20, 2005
- 89NewsPBS Frontline: 'Spying on the Home Front'Rick Young — PBS: Frontline — May 16, 2007
- 90NewsFormer intel chief: Homegrown terrorism is a devil of a problemJordy Yager — July 25, 2010
- 91JournalUnderstanding Terror NetworksMark Sageman — U. of Pennsylvania Press — 2004
- 92NewsPersonal Characteristics of Lone-Actor TerroristsEdwin Bakker et al. — February 29, 2016
- 93BookThinking Like a TerroristMike German — Potomac Books — 2007
- 94BookSuperfreakonomics: global cooling, patriotic prostitutes, and why suicide bombers should buy life insuranceSteven D. Levitt et al. — William Morrow — 2009
- 95NewsFear of the unknownSean Coughlan — August 21, 2006
- 97Background Report: ETA Ceasefires by the NumbersThe National Consortium for the Study of Terrorism and Responses to Terrorism (START)
- 99NewsBritish anger at terror celebrationNed Parker et al. — July 20, 2006
- 100JournalBritish Intelligence and the Mandate of Palestine: Threats to British national security immediately after the Second World WarCalder Walton — 2008
- 101MagazineTripped UpJeremy Lott — October 6, 2004
- 102NewsWhat to know about Iran's role in the Israel–Hamas warOctober 20, 2023
- 103NewsExplainer: What you need to know about Hezbollah, the group backing Hamas against IsraelReuters — October 17, 2023
- 105NewsHamas received weapons and training from Iran, officials sayJoby Warrick et al. — October 10, 2023
- 107JournalAims and activities of the Stern Group in PalestineDecember 1, 1944
- 111JournalAnti-Terrorist Finance in the United Kingdom and United StatesLaura K. Donohue — Stanford University Center for International Security and Cooperation — 2006
- 113Republic of Ireland played integral role in supporting IRA, says historianNews Letter — April 5, 2019
- 114NewsSupport in Republic during Troubles 'key for IRA', book claimsJohn Manley — The Irish News — April 6, 2019
- 115Terrorist FinancingThe Financial Action Task Force
- 116BookThe Day Wall Street Exploded: A Story of America in its First Age of TerrorBeverly Gage — Oxford University Press — 2009
- 117NewsThe Logic of Suicide TerrorismBruce Hoffman — June 2003
- 118NewsHackers warn high street chainsApril 25, 2008
- 119NewsRise O Muwahhid, Wherever You May Be: An Analysis of the Democratization of the Terrorist Threat in the WestReinier Bergema et al.
- 120BookTerrorism: the Power and Weakness of FearJuan Romero — Routledge — 2022
- 121NewsIsraeli–Palestinian violence: What you need to knowBen Wedeman — CNN — October 15, 2015
- 122MagazineA Timeline of Recent Terrorist Attacks in EuropeNash Jenkins — December 19, 2016
- 123News2 Brussels Police Officers Are Stabbed in 'Potential Terrorist Attack'Alissa Rubin — October 5, 2016
- 124Bin Laden and the Theater of TerrorismThomas de Waal
- 125BookTerror in the Mind of GodMark Juergensmeyer — University of California Press — 2000
- 126NewsResponding to Cyber Jihad: Towards an Effective Counter NarrativeBibi van Ginkel — The International Centre for Counter-Terrorism – The Hague (ICCT) — March 31, 2015
- 128BookTerrorism & Public Safety Policing: Implications of the Obama PresidencyPastor, James F. — Taylor & Francis — 2009
- 131JournalTourism in crisis: Managing the effects of terrorismS.F. Sönmez et al. — 1999
- 132JournalTourism and the globalisation of fear: Analysing the politics of risk and (in) security in global travelR Bianchi — 2006
- 133JournalTourist worries after terrorist attacks: Report from a field experimentW. Brun et al. — 2011
- 134Journal100 Core and Periphery Journals for Terrorism ResearchJ Tinnes — 2013
- 135JournalTerrorism Research Centres: 100 Institutes, Programs and Organisations in the Field of Terrorism, Counter-Terrorism, Radicalisation and Asymmetric Warfare StudiesBenjamin Freedman — November 2010
- 13670 countries sign Counter-Terrorism Code initiated by KazakhstanNovember 8, 2018
- 137NewsA hidden world, growing beyond controlDana Priest et al. — July 19, 2010
- 138JournalViolent Competition and Terrorist RestraintSara M. T. Polo et al. — March 2024
- 139BookHow Terrorism Ends: Understanding the Decline and Demise of Terrorist CampaignsAudrey Kurth Cronin — Princeton U. Press — 2009
- 140Pds SsoEprints.unimelb.edu.au
- 142The Legal Debate is Over: Terrorism is a War Crime | The New America FoundationMichael Lind — Newamerica.net — May 2, 2005
- 143Press conference with Kofi Annan & FM Kamal KharraziUnited Nations — January 26, 2002
- 144NewsThe Superpowers and International TerrorMichael Stohl — International Studies Association, Atlanta — April 1, 1984
- 145NewsTerrible beyond Endurance? The Foreign Policy of State TerrorismMichael Stohl — International Studies Association, Atlanta — 1988
- 146NewsThe State as Terrorist: The Dynamics of Governmental Violence and RepressionMichael Stohl — International Studies Association, Atlanta — 1984
- 147NewsThe 'No Rent' Manifesto.; Text of the Document Issued by the Land LeagueAugust 2, 2009
- 148JournalThe Political Economy of State TerrorKisangani, E. — 2007
- 151BookState Terrorism and Neoliberalism: The North in the SouthRuth Blakeley — Routledge — 2009
- 152BookFinal Solutions: Mass Killing and Genocide in the 20th CenturyBenjamin A. Valentino — Cornell University Press — 2005
- 153BookThe Jakarta Method: Washington's Anticommunist Crusade and the Mass Murder Program that Shaped Our WorldVincent Bevins — PublicAffairs — 2020
- 154BookEconomists with Guns: Authoritarian Development and U.S.–Indonesian Relations, 1960–1968Bradley Simpson — Stanford University Press — 2010
- 156BookState Violence and Genocide in Latin America: The Cold War Years (Critical Terrorism Studies)J. Patrice McSherry — Routledge — 2011
- 158NewsState Sponsored Terrorismtrackingterrorism.org
- 159BookThe Psychology of Terrorism FearsSamuel Justin Sinclair et al. — Oxford University Press, US — 2012
- 160BookTerrorism and Homeland SecurityJonathan R. White — Cengage Learning — January 1, 2016
- 161BookHistorical Atlas of IslamMalise Ruthven et al. — Harvard University Press — April 24, 2017
- 162NewsThe Illusion of War: Is Terrorism a Criminal Act or an Act of War?Andrew Majoran — Mackenzie Institute — August 1, 2014
- 163BookRejecting refugees: political asylum in the 21st centuryCarol Bohmer — Routledge — 2010
- 164Is 'Terrorism' a War Crime Triable by Military Commission? Who Knows?Daphne Eviatar — June 13, 2013
- 165JournalHow to Define TerrorismJenny Teichman — 1989
- 169NewsGuardian and Observer style guide: TDecember 19, 2008
- 172"Terruqueo" and Peru's Fear of the LeftLuisa Feline Freier et al. — January 13, 2021
- 174BookEl Profe: Cómo Pedro Castillo se convirtió en presidente del Perú y qué pasará a continuaciónRaúl Asensio et al. — Institute of Peruvian Studies — August 2021
- 175NewsUN staggers on road to reformPaul Reynolds — September 14, 2005
- 176BookRoot Causes of Suicide Terrorism: The Globalization of MartyrdomAmi Pedahzur — Routledge — 2006
- 181BookPeacemaker's Toolkit Talking to Groups that Use TerrorismNigel Quinney et al. — United States Institute of Peace — 2011
- 182The killing of Hassan Nasrallah and how the west legitimised its use of assassinationEmil Archambault et al. — October 3, 2024
- 189NewsHunt WikiLeaks founder like al-Qaeda and Taliban LeadersMartin Beckford — November 30, 2010
- 190NewsJulian Assange like a hi-tech terroristEwen MacAskill — December 19, 2010
- 191BookOpium: Uncovering the Politics of the PoppyPierre-Arnaud Chouvy — Harvard University Press — 2009