

Hanssen sold thousands of classified documents to the KGB that detailed U.S.

Throughout his spying, Hanssen remained anonymous to the Russians. Hanssen restarted communications the next year and continued until his arrest. He restarted his espionage activities in 1985 and continued until 1991, when he ended communications during the collapse of the Soviet Union, fearing he would be exposed. In 1979, three years after joining the FBI, Hanssen approached the Soviet Main Intelligence Directorate (GRU) to offer his services, beginning his first espionage cycle, lasting until 1981. history." Hanssen is currently serving 15 consecutive life sentences without parole at ADX Florence, a federal supermax prison near Florence, Colorado. His espionage was described by the Department of Justice as "possibly the worst intelligence disaster in U.S. 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 1979 to 2001.
