The Spy Who Fooled the FBI

1381. In the English countryside, one peasant has had enough. His resistance leads tens of thousands of armed peasants to march on London. They’re furious about taxes, about wages held down by law, about a world that feels abandoned by God. But they aren’t marching to overthrow t ...  Show more

September 20, 1187. It’s daytime outside the walls of Jerusalem. Saladin, the Sultan of Egypt, ponders his next attack. His troops encircle and lay siege to the city. They vastly outnumber the Crusader knights inside, and Saladin is on the cusp of a victory he never dreamed possi ...  Show more

Robert Hanssen was an FBI agent who became one of the most notorious spies in U.S. history, secretly selling classified information to the Soviet Union and Russia for over 20 years. His betrayal compromised national security, exposed double agents, and led to the deaths of Ame ...

Robert Hanssen was a conundrum - an FBI agent and self-proclaimed patriot who became the most damaging spy in the bureau's history. Amid the nuclear threat of the Cold War, America's prized secrets were falling into the hands of its sworn enemy—the Kremlin. The FBI's hunt for the ...  Show more

Robert Hanssen was a conundrum - an FBI agent and self-proclaimed patriot who became the most damaging spy in the bureau's history. Amid the nuclear threat of the Cold War, America's prized secrets were falling into the hands of its sworn enemy—the Kremlin. The FBI's hunt for the ...  Show more

How did the FBI allow a spy to operate in its midst for more than 20 years and do such devastating damage? Robert Hanssen’s tradecraft was good, but far from perfect. In fact, the FBI missed several chances to nab him. Drop us a line: agentofbetrayal@cbsnews.com Learn more about ...  Show more