Robert Hanssen was an American FBI agent and one of the most damaging spies in United States history. From the late 1970s until his arrest in 2001, he secretly passed highly classified information to Soviet and later Russian intelligence services (the KGB and SVR). His betrayals included revealing the identities of U.S. double agents, some of whom were later arrested or executed. In exchange, Hanssen received more than $1.4 million in cash and diamonds 💰💎. He was arrested in 2001 and sentenced