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U.S. intelligence involvement with German war criminals after World War II
US military and intelligence agencies protected some war criminals in the interest of obtaining technical or intelligence information from them, or taking part in ongoing intelligence or engineering (e.g., Operation Paperclip (WP)). The relationships with German war criminals started immediately after the end of WWII (WP), but some of the Japanese relationships were slower to develop. Multiple US intelligence organizations were involved, especially between the dissolution of the Office of Strategic Services (WP) (OSS) in 1945 and the establishment of the CIA in 1947. The United States Army Military Intelligence, the United States Army Counter Intelligence Corps (CIC), G-2, under Douglas MacArthur's command and the direction of Major General Charles A. Willoughby. Other contracts with war criminals were conducted by various interim groups that existed between 1945 and 1952, such as the Strategic Services Unit or Office of Policy Coordination.
Some of these relationships were dropped when the Central Intelligence Agency (WP) established its authority, others were continued under the CIA, and yet others moved from US control to their home nations. In the cases where the CIA took over the relationships, they concealed them for nearly 60 years.
Michael Salter. Nazi war crimes, US intelligence and selective prosecution at Nuremberg, Routledge.