In January, 1950, a British scientist named Klaus Fuchs (1911 – 1988) was arrested for passing atomic secrets on to Soviet agents.
"He had worked in New York and Los Alamos with the British scientific mission from 1943 to 1946 and had participated after the war in top-level American-British-Canadian atomic talks. Probably few scientists in the world knew more than he exactly what was going on."
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You can read about Alger Hiss HERE...