Original: The thirty-seven-year history of the USSR KGB ended when its Chairman, Col.-Gen. Vladimir Kryuchkov, led the 19 - 21 August 1991 Soviet coup d'état attempt to depose Soviet President Mikhail Gorbachev.
Simplified: The KGB was dissolved when its chief, Colonel-General Vladimir Kryuchkov, used the KGB's resources in aid of the August 1991 coup attempt to overthrow Soviet President Mikhail Gorbachev.