Robert Hanssen: The FBI Agent Who Worked for the KGB

Robert Philip Hanssen (born April 18, 1944) is a former Federal Bureau of Investigation (FBI) agent who spied for Soviet and Russian intelligence services against the United States from 1979 to 2001. His espionage was described by the Department of Justice as "possibly the worst intelligence disaster in U.S. history." He is currently serving 15 consecutive life sentences at ADX Florence, a federal supermax prison near Florence, Colorado.

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