Short answers, pulled from the story.
The term blowback first appeared in formal print within the document titled Clandestine Service History, Overthrow of Premier Mossadeq of Iran. That report was published in March 1954 and covered events from November 1952 through August 1953.
The word blowback emerged from the Central Intelligence Agency's records regarding the 1953 Iranian coup d'état. This operation involved American and British governments sponsoring efforts to remove Mohammad Mosaddeq between November 1952 and August 1953.
The Central Intelligence Agency financed Afghan insurgents to fight a proxy war against the Soviet Union from 1986 to 1992. Some beneficiaries of this support eventually joined Al-Qaeda's terrorist campaign against the United States.
Yevno Azef served as a paid police informant for the Russian secret-police Okhrana while posing as a revolutionary assassin. He maintained this double role until 1908 receiving 1000 rubles a month from the authorities.
Secretly funded right-wing Contras fighting the left-wing Sandinista government engaged in drug-dealing operations inside American cities. The Iran-Contra Affair occurred when the administration sold weapons to Iran to arm those same Contras.