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USA PATRIOT Act, U.S. legislation, passed by Congress in response to the September 11, 2001, terrorist attacks and signed into law by Pres. George W. Bush in October 2001, that significantly expanded the search and surveillance powers of federal law-enforcement and intelligence agencies. The USA PATRIOT Act, as amended and reauthorized from 2003, made numerous changes to existing statutes relating to the privacy of telephone and electronic communications, the operation of the Foreign Intelligence Surveillance...