Office of Strategic Services
The Office of Strategic Services (OSS) was a wartime intelligence agency of the United States during World War II, and a predecessor of the modern Central Intelligence Agency (CIA). The OSS was formed to coordinate espionage activities behind enemy lines for the United States Armed Forces branches. Other OSS functions included the use of propaganda, subversion, and post-war planning.
Origin
Prior to the formation of the OSS, 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. It had no overall direction, coordination, or control. The US Army and US Navy had separate code-breaking departments: Signals Intelligence Service and OP-20-G. (A previous code-breaking operation of the State Department, the MI-8, run by Herbert Yardley, had been shut down in 1929 by Secretary of State Henry Stimson, deeming it an inappropriate function for the diplomatic arm, because "gentlemen don't read each other's mail".) The FBI was responsible for domestic security and anti-espionage operations.