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The massive extent of the NSA's spying, both foreign and domestic, was revealed to the public in a series of detailed disclosures of internal NSA documents beginning in June 2013.Most of the disclosures were leaked by former NSA contractor, Edward Snowden.The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence. Unlike the Defense Intelligence Agency (DIA) and the Central Intelligence Agency (CIA), both of which specialize primarily in foreign human espionage, the NSA does not publicly conduct human-source intelligence gathering.The NSA is responsible for global monitoring, collection, and processing of information and data for foreign intelligence and counterintelligence purposes, specializing in a discipline known as signals intelligence (SIGINT). The NSA is entrusted with providing assistance to, and the coordination of, SIGINT elements for other government organizations - which are prevented by law from engaging in such activities on their own. To further ensure streamlined communication between the signals intelligence community divisions, the NSA Director simultaneously serves as the Commander of the United States Cyber Command and as Chief of the Central Security Service.
In the aftermath of the September 11 attacks, the NSA created new IT systems to deal with the flood of information from new technologies like the Internet and cellphones.The documents also revealed the NSA tracks hundreds of millions of people's movements using cellphones metadata. and was part of the war effort under the executive branch without direct Congressional authorization. At that point, the unit consisted of Yardley and two civilian clerks.Internationally, research has pointed to the NSA's ability to surveil the domestic Internet traffic of foreign countries through "boomerang routing". A code and cipher decryption unit was established as the Cable and Telegraph Section which was also known as the Cipher Bureau. During the course of the war it was relocated in the army's organizational chart several times. It absorbed the navy's Cryptanalysis functions in July 1918. Army cryptographic section of military intelligence, known as MI-8, in 1919, the U. government created the Cipher Bureau, also known as Black Chamber.The origins of the National Security Agency can be traced back to April 28, 1917, three weeks after the U. World War I ended on November 11, 1918, and the army cryptographic section of Military Intelligence (MI-8) moved to New York City on May 20, 1919, where it continued intelligence activities as the Code Compilation Company under the direction of Yardley. The Black Chamber was the United States' first peacetime cryptanalytic organization.Jointly funded by the Army and the State Department, the Cipher Bureau was disguised as a New York City commercial code company; it actually produced and sold such codes for business use.