The Central Intelligence Agency (CIA) is a civilian foreign intelligence service of the United States federal government, classified as an independent agency within the executive branch. It was formally established on September 18, 1947, when President Harry S. Truman signed the National Security Act of 1947 into law. The CIA was created to solve the problem of fragmented intelligence coordination, which was highlighted by the surprise attack on Pearl Harbor, and to centralize intelligence efforts amid the growing tensions of the Cold War.
The agency's primary mechanism is to advance national security by collecting and analyzing intelligence from around the world and conducting covert operations. The National Security Act of 1947 charged the CIA with coordinating the nation's intelligence activities, collecting, evaluating, and disseminating intelligence affecting national security. The subsequent Central Intelligence Agency Act of 1949 allowed the agency to secretly fund intelligence operations and develop personnel procedures outside standard government practices. The CIA operates primarily overseas and is explicitly prohibited from exercising police, subpoena, or law enforcement powers or internal security functions within the United States.
The CIA is a major member of the United States Intelligence Community (IC), which includes other agencies like the Federal Bureau of Investigation (FBI) and the National Security Agency (NSA). Since the passage of the Intelligence Reform and Terrorism Prevention Act of 2004, the CIA Director reports to the Director of National Intelligence (DNI), who oversees the entire IC. A significant recent change is the CIA's organizational restructuring around multidisciplinary Mission Centers, which combine analytic, operational, and technical capabilities to address complex threats like counterterrorism and cyber intelligence. This structure, favored by Director William Burns, has led to the effective dismantling of units like the Economic Security Center, with its functions being split among regional and mission centers. The agency is currently divided into five major Directorates, including the Directorate of Digital Innovation and the Directorate of Operations.