Robert Philip Hanssen (born April 18, 1944) is an American former Federal Bureau of Investigation (FBI) double agent who spied for Soviet and Russian intelligence services against the United States from 1976 to 2001. His espionage was described by the Department of Justice as "possibly the worst intelligence disaster in U.S. history."[3] Hanssen is currently serving 15 consecutive life sentences without parole at ADX Florence, a federal supermax prison near Florence, Colorado.

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