Robert Philip Hanssen (born April 18, 1944) is a former U.S. Federal Bureau of Investigation (FBI) agent who spied for Soviet and Russian intelligence services against the United States for twenty-two years from 1979 to 2001. He is currently serving fifteen consecutive life sentences at ADX Florence, a federal supermax prison near Florence, Colorado.

Hanssen was arrested on February 18, 2001 at Foxstone Park near his home in Vienna, Virginia, and was charged with selling U.S. secrets to the Soviet Union and subsequently the Russian Federation for more than US$1.4 million in cash and diamonds over a 22-year period.

On July 6, 2001, he pleaded guilty to fifteen counts of espionage in the United States District Court for the Eastern District of Virginia. His activities have been described by the Department of Justice's Commission for the Review of FBI Security Programs as "the worst intelligence disaster in U.S. history."

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