Shortly after midnight on the 25th February 1956, Soviet leader Nikita Khrushchev delivered his ‘secret speech’, officially called “On the Cult of Personality and Its Consequences”, in a four hour “closed session” at the end of the 20th Party Congress of the Communist Party of the Soviet Union.
The Tsar Bomba, the most powerful explosive weapon ever created, was detonated by the USSR.
A U-2 spy plane captured images of the construction of a missile site on Cuba, triggering the Cuban Missile Crisis.
Beginning at midnight on the 13th August 1961, East German police and army began to close the border with West Berlin.
On June 16th 1958, Hungarian Communist politician Imre Nagy was executed.