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That Agency -- one of the largest of the intelligence agencies -- was created by Executive Order in 1952. Although NSA's mission is to obtain foreign intelligence from "foreign" communications, this has been interpreted to permit NSA to intercept communications where one terminal -- the sender or receiver -- was in the United States. Consequently when an American has used telephone or telegraph facilities between this country and overseas, his message has been subject to interception by NSA. NSA obtained copies of millions of private telegrams sent from, to or through the United States in its SHAMROCK program and complied with requests to target the international communications of specific Americans through the use of a watch list.