Original: In the 1980s, the glasnost liberalisation of Soviet society provoked KGB Chairman Vladimir Kryuchkov (1988 â "91) to lead the August 1991 Soviet coup d' Ã tat attempt to depose President Mikhail Gorbachev.
Simplified: The KGB ended when its chief, Colonel-General Vladimir Kryuchkov, used the KGB's resources to help the August 1991 coup attempt to overthrow Soviet President Mikhail Gorbachev.