National Security Act of 1947

The National Security Act of 1947 is the principal statute establishing the modern US national-security architecture. Signed into law by President Harry Truman on 26 July 1947, the Act created four institutional structures whose contemporary descendants comprise the principal US national-security apparatus: the Central Intelligence Agency (replacing the wartime Office of Strategic Services and its post-war successor the Central Intelligence Group); the National Security Council as the principal Executive Branch national-security coordinating body; the National Military Establishment (renamed the Department of Defense in the 1949 amendments) consolidating the previously-separate War Department and Navy Department under a single civilian Secretary; and the Department of the Air Force as a separate military department, breaking the Air Force out of the Army Air Forces it had been part of through the Second World War.¹

The institutional history that produced the Act was the substantive post-war reorganisation of the US government's national-security functions in response to the institutional lessons drawn from the Second World War. The principal documented institutional consequence the Act sought to address was the substantive coordination failure across the pre-Pearl-Harbor intelligence apparatus — distributed across the War Department's Military Intelligence Division, the Navy's Office of Naval Intelligence, the State Department, the FBI, and several smaller bodies, with no institutional mechanism for combined assessment. The wartime Office of Strategic Services, established by President Roosevelt in June 1942 under William Donovan, had been the first institutional attempt at a unified national-intelligence organisation; the 1947 Act's establishment of CIA as the institutional successor was substantially driven by Donovan's wartime advocacy and by the institutional consensus that the wartime apparatus's strengths needed permanent peacetime institutionalisation.²

The substantive content of the Act for the intelligence-community institutional framework is principally located in Section 102, which established CIA and defined its functions. The principal restriction the Section established — that CIA "shall have no police, subpoena, law-enforcement powers, or internal-security functions" — has been the institutional foundation for the subsequent doctrinal question of CIA activity within the United States, which has been the principal contested area in the substantial subsequent declassified record on CIA Cold War operations (the Operation CHAOS domestic-surveillance programme; the HTLINGUAL mail-opening programme; the MKUltra behavioural-modification programme's US-citizen testing). The Section's provision for the Director of Central Intelligence as the head of CIA — and, in the institutional position the role evolved into, as the substantive head of the broader intelligence community — established the institutional architecture that the DCI role occupied until its 2005 reorganisation into the contemporary DNI framework.³

The Act has been substantially amended across the post-1947 period. The principal amendments include the 1949 amendments (which strengthened the Secretary of Defense's institutional authority and renamed the National Military Establishment as the Department of Defense); the 1958 Department of Defense Reorganization Act (which further centralised DoD authority); the 1980 Intelligence Oversight Act (which established the contemporary Congressional intelligence-oversight framework); the 1991 Intelligence Authorization Act amendments (which added Section 503 codifying the covert-action authorisation framework and the presidential finding requirement); and most consequentially the 2004 Intelligence Reform and Terrorism Prevention Act, which established the Director of National Intelligence as the community-coordinating role separate from the directorship of CIA, replacing the dual-hatted DCI/CIA-Director arrangement that had operated since 1947.⁴

The contemporary significance of the National Security Act for the institutional intelligence-community framework is twofold. First, the Act's institutional architecture — the separation of foreign-intelligence collection from domestic security, the establishment of NSC-level coordination, the integration of military and civilian intelligence under a single community framework — has been the principal structural feature of the US national-security apparatus across the post-1947 period, and the substantial subsequent amendments have refined rather than replaced that architecture. Second, the substantive institutional questions that have produced the principal documented controversies in the post-1947 intelligence record — CIA activity within the United States, the boundary between covert action and military operations, the institutional accountability of intelligence services to Congressional oversight — are all questions the Act's original 1947 architecture left ambiguously specified, and the subsequent amendments and Executive Orders (principally Executive Order 12333, as amended) have substantively been institutional attempts to resolve those ambiguities under the framework the original Act established.

See also

• Intelligence community — the institutional collective the Act established
• DCI — the pre-2005 community-coordinating role specified in Section 102
• DNI — the post-2005 community-coordinating role established by IRTPA 2004's amendment of the Act
• Covert action — the operational category codified in Section 503 (added 1991)
• Finding — the presidential authorisation requirement codified in Section 503
• Executive Order 12333 — the principal Executive Order operating under the Act's framework
• OSS — the wartime predecessor whose institutional lessons substantially shaped the Act

Sources & Further Reading

1. National Security Act of 1947, Pub. L. 80-253, 61 Stat. 495 (26 July 1947), as amended; codified at 50 USC §§ 3001–3221.
2. Amy Zegart, Flawed by Design: The Evolution of the CIA, JCS, and NSC (Stanford University Press, 1999); Tim Weiner, Legacy of Ashes: The History of the CIA (Doubleday, 2007), chapters 1–3 for the institutional history of the OSS-to-CIG-to-CIA transition.
3. National Security Act of 1947, Section 102, as amended; Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities (Church Committee), Final Report, Book I, "Foreign and Military Intelligence" (April 1976), section on the National Security Act framework.
4. Intelligence Reform and Terrorism Prevention Act of 2004, Pub. L. 108-458; Intelligence Authorization Act for Fiscal Year 1991, Pub. L. 102-88; Intelligence Oversight Act of 1980, Pub. L. 96-450; National Security Act Amendments of 1949, Pub. L. 81-216.