Short answers, pulled from the story.
Pierre-Joseph Proudhon was the first political philosopher to explicitly call himself an anarchist. He published his seminal work What Is Property? in 1840 and argued that the state was an illegitimate power that must be abolished.
The classical era of anarchism spanned from the 1870s to the end of the Spanish Civil War in 1939. This period represented the movement's most potent time of global influence and revolutionary action.
Léon Czolgosz assassinated U.S. President William McKinley in 1901. This act was part of the propaganda of the deed strategy used by some anarchists to inspire mass revolution through political violence.
Francisco Ferrer established the Escuela Moderna school in Barcelona in 1901. This secular school rejected state and church involvement and gave pupils autonomy in planning their work.
The Immigration Act of 1903, also known as the Anarchist Exclusion Act, barred anarchists from entering the United States in 1903. This law was passed in response to the movement's association with political violence and terrorism.
The Paris Commune occurred in 1871 and served as a crucial laboratory for anarchist ideas. Workers and peasants briefly seized control of the city to attempt building a stateless society before it was brutally suppressed.