The official website of the U.S. Central Intelligence Agency (CIA). The U.S. Central Intelligence Agency (CIA) is the largest intelligence agency in the United States, created in 1947 by President Harry Truman signed the "National Security Act", the main task is to openly and secretly collect and analyze intelligence on foreign governments, companies and individuals in politics, culture, technology and other aspects, coordinate the activities of other domestic intelligence agencies, and report this intelligence to the various departments of the U.S. government. It also coordinates the activities of other domestic intelligence agencies and reports this intelligence to various departments of the U.S. government.