
The Central Intelligence Agency (CIA) is a US intelligence agency that was created by the National Security Act of 1947. The Act was signed into law by President Harry S. Truman and reorganised the structure of the US armed forces following World War II. It also established the National Security Council (NSC) and separate departments for each branch of the armed forces. The CIA is headed by a director and is responsible for gathering intelligence, particularly overseas, and has been involved in several notable historical events, including the War on Terror and regime change in foreign countries.
| Characteristics | Values |
|---|---|
| Name of the law | National Security Act of 1947 |
| Signed by | President Harry S. Truman |
| Year | 1947 |
| Month | July |
| Purpose | To reorganise the structure of the U.S. armed forces following World War II |
| Other key aspects | Established the National Security Council (NSC); established the office of Secretary of Defense; combined the Department of War and the Navy Department into the Department of Defense |
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What You'll Learn

The National Security Act of 1947
The Act created several institutions that would assist the President in formulating and implementing foreign policy. Notably, it established the Central Intelligence Agency (CIA) and the National Security Council (NSC). The NSC included the President, Vice President, Secretary of State, Secretary of Defense, and other members such as the Director of the CIA. The NSC was tasked with discussing both long-term problems and immediate national security crises, and managing smaller subcommittees to address threats to national security.
The National Security Act also created the office of Secretary of Defense to oversee the nation's military establishment. It combined the former Department of War and the Navy Department (including the US Marine Corps) into the Department of Defense (DoD), alongside the Departments of the Army and Air Force. This reorganisation aimed to create a clear and direct line of command for all military services, eliminate duplication of effort, and provide more efficient administration and unified strategic direction for the armed forces.
Additionally, the Act established the position of Director of Central Intelligence, who was responsible for managing the CIA and overseeing the entire intelligence community. The stated goal of the National Security Act was to enhance the coordination of national security efforts with the intelligence community, ensuring a cohesive approach to protecting the nation.
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The CIA's creation was a product of debates among military, state and defence leaders
The creation of the CIA was the result of extensive discussions among military, state, and defence leaders, with input from the public, in the aftermath of World War II. The US government faced the challenge of restructuring its foreign policy and military establishments, while also addressing the fears of Americans regarding the potential resemblance of their government to the defeated Nazi regime.
The National Security Act of 1947, signed into law by President Harry S. Truman, played a pivotal role in the CIA's formation. This act mandated a significant reorganisation of US foreign policy and military structures, establishing institutions that would aid presidents in formulating and executing foreign policy. It created the National Security Council (NSC), which included the President, Vice President, Secretary of State, Secretary of Defense, and other key members, such as the Director of the Central Intelligence Agency. The NSC was tasked with addressing both long-term issues and immediate national security crises.
The National Security Act also emphasised the coordination of national security with the intelligence community. It established the position of Director of Central Intelligence, who was responsible for managing the CIA and overseeing the broader intelligence community. The Act's goal was "to provide a comprehensive program for the future security of the United States", and it made several organisational changes to achieve this.
The establishment of the CIA was a gradual process, shaped by debates and evolving perspectives. Initially, President Truman envisioned an agency that centralised intelligence and provided reports to the President. However, as the Cold War intensified, he became more receptive to the idea of a more robust intelligence agency. The CIA's creation was further influenced by the proposal for a post-war intelligence agency outlined by William Donovan, the Director of the Office of Strategic Services (OSS), in a memo to Harold D. Smith, the Director of the Bureau of the Budget, in August 1945.
In 1949, President Truman signed the Central Intelligence Agency Act, which authorised the CIA to secretly fund intelligence operations and conduct personnel actions outside of standard US government procedures. This act further solidified the CIA's role and capabilities in the realm of intelligence gathering and covert operations.
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The Act reorganised the structure of the US Armed Forces
The Central Intelligence Agency (CIA) was established by the National Security Act of 1947, which was signed into law by President Harry S. Truman in July 1947. This Act reorganised the structure of the US Armed Forces, combining the former Department of War and the Navy Department (including the US Marine Corps) into the Department of Defense (DoD). The DoD also included the Departments of the Army and Air Force, creating a unified command structure for all military services.
The reorganisation aimed to streamline military operations and eliminate duplication of efforts, particularly in research and engineering. It also established a clear and direct line of command for all military services, providing more efficient and economical administration. Additionally, the Act created the Joint Chiefs of Staff (JCS) to advise the President on military strategy and planning.
The National Security Act of 1947 also established the office of the Secretary of Defense, who would oversee the nation's military establishment. It mandated a major reorganisation of US foreign policy and military establishments, creating institutions that would assist the President in formulating and implementing foreign policy. This included the establishment of the National Security Council (NSC), which included the President, Vice President, Secretary of State, Secretary of Defense, and other members such as the Director of the Central Intelligence Agency.
The NSC was tasked with coordinating foreign policy materials from various agencies for the President and managing smaller subcommittees to address national security threats. The Act also provided for the coordination of the military with other government departments and agencies concerned with national security, such as the CIA, ensuring presidential and congressional oversight regarding national intelligence matters.
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It established the National Security Council (NSC)
The National Security Act of 1947 mandated a major reorganisation of the US government's foreign policy and military establishments. The Act created many institutions that would aid the President in formulating and implementing foreign policy, including the National Security Council (NSC).
The NSC was established to assist in coordinating the nation's security assets. It includes the President, Vice President, Secretary of State, Secretary of Defense, the President's national security adviser, and other members such as the Director of the Central Intelligence Agency (CIA), as well as other presidential appointees approved by the Senate.
The NSC also manages smaller subcommittees to address threats to national security. It was designed to provide a clear and direct line of command for all military services, eliminating duplication of effort in the Department of Defense, and providing more efficient and economical administration.
The NSC staff was hired to coordinate foreign policy materials from other agencies for the President. Beginning in 1953, the President's Assistant for National Security Affairs directed this staff. Each President has given the NSC staff varying levels of autonomy and influence.
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The Act also created the office of Secretary of Defence
The Central Intelligence Agency (CIA) was established by the National Security Act of 1947, which was signed into law by President Harry S. Truman. The Act reorganised the structure of the U.S. armed forces and the military and foreign policy establishments of the U.S. Government following World War II.
The National Security Act of 1947 was a comprehensive programme aimed at ensuring the future security of the United States. It made several organisational changes and emphasised the coordination of national security with the intelligence community. The Act created many of the institutions that Presidents have found useful when formulating and implementing foreign policy.
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Frequently asked questions
The National Security Act of 1947, signed into law by President Harry S. Truman, created the CIA.
The National Security Act reorganised the structure of the U.S. armed forces following World War II. It also established the National Security Council (NSC) and separate departments for each branch of the armed forces.
The CIA is responsible for intelligence gathering overseas, with limited domestic intelligence collection. It has no law enforcement function. The CIA is headed by a director and is divided into various directorates, including a Directorate of Analysis and Directorate of Operations.





















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