Robert Hanssen was a career FBI officer who spent decades spying for the Soviet Union, including the GRU the Soviet military intelligence unit- and the KGB. Hanssen worked his way up in the FBI and was charged with a variety of jobs related to intelligence gathering and counter-intelligence for the FBI. He sold what he knew to the Russians for more than $1 million in cash and diamonds between 1979 and 1999. He was finally arrested in February, 2001, in the act of passing on classified documents and pled guilty to 13 counts of espionage in 2001 in exchange for a life sentence.”]