It has now been firmly established (see references below) that the OSS actively recruited and protected many high ranking Nazi officers immediately following World War II, a policy that was carried on by the CIA. These included, the CIA now admits, the notorious "butcher of Lyon" Klaus Barbie, Hitler's Chief of Soviet Intelligence General Reinhard Gehlen, and numerous less-renowned Gestapo officers. General Gehlen, due to his extensive (if dubious) intelligence assets within the Soviet Union, was allowed to keep his spy-network intact after the war in the service of the United States. The Gehlen organization soon became one of America's chief sources of Intelligence on the Soviet Union during the cold war, and formed the basis for what would later become the German intelligence agency the BND.
From the wiki's CIA article...
From the wiki's CIA article...