Double Agent Operations
1. Arthur Owens aka Snow
2. Juan Frutos aka Dragoman
3. James Rivington - Revolutionary War
WWII
1. Juan Pujol Garcia aka Garbo - WWII
2. William Sebold - WWII - led to the takedown of the Duquesne spy ring of 33 Nazi spies, the largest number of convictions of an espionage ring in U.S. history
3. Dusko Popov aka Tricycle - Yugoslavian
Frequently used, but not double agents:
Robert Hanssen
Aldrich Hazen Ames
Oleg Pentkovsky