15. Robert Hanssen: The Mole Within the FBI
Robert Hanssen appeared to be the ultimate insider—a devoted FBI agent, loving husband, and loyal American. Yet for over two decades, Hanssen secretly betrayed his country, passing highly classified information to the Soviet Union and later Russia in exchange for cash and diamonds. His espionage is considered one of the most devastating breaches in U.S. intelligence history. The depth of his deception shocked colleagues and the nation alike when he was finally exposed. Read more
