In 1953, the Soviet leader Joseph Stalin died, and Nikolai Bulganin and Nikita Khrushchev took his place. Khrushchev later took sole control of the Soviet Union. Khrushchev's Secret Speech marked a period of de-Stalinization, and Khrushchev tried to undo many of the things done by Stalin (such as the Gulag prisons and Stalin's cult of personality).
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