Herbert Yardley
American cryptologist who wrote the expose "The American Black Chamber."
Igor Gouzenko
Soviet cipher clerk who defected to Canada, turning over Soviet secrets.
James Jesus Angleton
Head of Counter-Intelligence for the CIA and a noted mole-hunter.
Morris Childs
An America-born Soviet spy who later became a double agent for the US.
Oleg Penkovsky
Soviet colonel who exposed the existence of Soviet missiles in Cuba.
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