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1991 August Coup
The 1991 Soviet coup attempt, also known as the August Coup, was a failed attempt by hardliners of the Communist Party of the Soviet Union (CPSU) to forcibly seize control of the country from Mikhail Gorbachev, who was Soviet president and General Secretary of the CPSU at the time.

https://www.britannica.com/topic/1991-Soviet-coup-attempt