The act of being a double agent is one of the most difficult and dangerous in espionage. To spy for an enemy nation while pretending to spy for your own nation requires courage, patience, and more than a little luck. American double agents, either born in the US or working for the US, provided information that led to key victories in the Revolutionary War and Civil War, destroyed a Nazi spy ring, and helped defuse the Cuban Missile Crisis.
At the same time, double agents working against America, both foreign and domestic, have led to dozens of American spies being exposed, intelligence agencies left in shambles, and national humiliation. Some have been killed, others jailed, and a few disappeared. Their motivations have ranged from financial need to patriotism to revenge.Here are the most famous double agents that have worked either for or against America.