The Office of Strategic Services (OSS) was a United States intelligence agency formed during World War II.
It was the wartime intelligence agency, and it was the predecessor of the Central Intelligence Agency (CIA). The agency was formed in order to coordinate espionage activities behind enemy lines for the branches of the United States military.
Prior to the formation of the OSS (the American version of the British Secret Intelligence Service and Special Operations Executive), American intelligence had been conducted on an ad-hoc basis by the various departments of the executive branch, including the State, Treasury, Navy, and War Departments.