Duncan Lee

Lt. Col. Duncan Chaplin Lee (1913–1988) was a confidential senior assistant to Maj. Gen. William ("Wild Bill") Donovan, founder and director of the Office of Strategic Services (OSS), World War II-era predecessor of the CIA, between 1942 and 1946. Lee has posthumously been identified by the Venona project as the NKVD mole inside the OSS with the code name "Koch", making Lee the most senior alleged spy the Soviet Union is ever known to have recruited inside the U.S. intelligence community. Provided by Wikipedia