The Trial of the Twenty-One, Moscow, USSR, 1938. Artist: Anon [Getty Images]

The Trial of the Twenty-One, Moscow, USSR 1938. The Trial of the Twenty-One was the last of a series of show trials of prominent Bolsheviks during Stalin's Great Purge. The most prominent defendant was Nikolai Bukharin, former head of the Communist Intern (Photo by Fine Art Images/Heritage Images/Getty Images)

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