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About this episode
Operating inside Moscow during the Cold War presented extraordinary dangers for American intelligence officers and their Soviet sources. One of the CIA’s most valuable sources was Adolf Tolkachev, a Soviet engineer who provided extensive information about military technology. His espionage required secret communications, clandestine meetings and constant concern about Soviet counterintelligence. Eventually, the operation collapsed and Tolkachev was arrested. His story demonstrates both the extraordinary value and extraordinary vulnerability of human intelligence.
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