The U.S. Central Intelligence Agency (CIA) was created by the National Security Act.
The creation of the U.S. Central Intelligence AGENCY was authorized by the National Security Act of 1947 (NSA), which also authorized creation of the the new position 'Secretary of Defense' (instead of the former 'War'), the new National Security Council (NCS), and a central intelligence agency - all signed into law by President Harry S. Truman on 26Jul1947.
The CIA agency structure was born in the former "Central Intelligence Group" (CIG) before the National Security Act became law. According to the CIA Center for the Study of Intelligence, officially, the CIG became the Central Intelligence Agency on September 18, 1947.
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