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Movies like Doppelagent George Blake (1969)

For ten years, the government official George Blake, recruited by the British secret service, also spies for the Soviet Union. Over 40 Western agents lost their lives behind the Iron Curtain as a result. In May 1961, Blake is sentenced to 42 years in prison. But that is not the end of the story. In 1966, Blake escapes from prison to the Soviet Union...