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The National Intelligence Authority (NIA) was the United States Government authority responsible for monitoring the Central Intelligence Group (CIG), the successor intelligence agency of the Office of Strategic Services established by President Harry S. Truman's presidential directive of 22 January 1946[1] in the aftermath of World War II. The National Intelligence Authority and Central Intelligence Group were both replaced respectively by the National Security Council and the Central Intelligence Agency under the National Security Act of 1947, which was implemented on 18 September 1947.[2]
- ^ Harry Truman (22 January 1946). "Presidential Directive on Coordination of Foreign Intelligence Activities". Office of the Historian.
- ^ [1] Central Intelligence Agency The Creation of the Intelligence Community: Founding Documents
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