John Andrew Walker, Jr. (born
July 28 1937) is a former Chief Warrant Officer and communications specialist for the
U.S. Navy, who sold his services as a
spy to the
Soviet Union from 1968 to 1985, the height of the
Cold War era. In this time he helped the Soviets decipher over two hundred thousand classified encrypted naval messages, and most observers agree that he was one of the most effective and destructive Soviet spies in U.S. modern history.
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