https://en.wikipedia.org/wiki/Patriot_Act

The USA PATRIOT Act (commonly known as the "Patriot Act" ) is an Act of the United States Congress that was signed into law by U.S. President George W. Bush on October 26, 2001. The title of the Act is a contrived three letter initialism (USA) preceding a seven letter acronym (PATRIOT), which in combination stand for Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001. The acronym was created by 23-year-old Congressional staffer Chris Cylke.

In response to the September 11 attacks and the 2001 anthrax attacks, Congress passed legislation to strengthen national security. On October 23, 2001, Republican Rep. Jim Sensenbrenner introduced H.R. 3162 incorporating provisions from a previously-sponsored House bill and a Senate bill also introduced earlier in the month. The next day, the Act passed the House by a vote of 357–66, with Democrats comprising the overwhelming portion of dissent. The three Republicans voting "no" were Robert Ney of Ohio, Butch Otter of Idaho, and Ron Paul of Texas. On October 25, the Act passed the Senate by a 98–1 vote, the only dissident being Russ Feingold of Wisconsin.

Those opposing the law have criticized its authorization of indefinite detentions of immigrants; the permission given to law enforcement to search a home or business without the owner's or the occupant's consent or knowledge; the expanded use of National Security Letters, which allows the Federal Bureau of Investigation (FBI) to search telephone, e-mail, and financial records without a court order; and the expanded access of law enforcement agencies to business records, including library and financial records. Since its passage, several legal challenges have been brought against the act, and federal courts have ruled that a number of provisions are unconstitutional.

Many of the act's provisions were to sunset beginning December 31, 2005, approximately four years after its passage. In the months preceding the sunset date, supporters of the act pushed to make its sun-setting provisions permanent, while critics sought to revise various sections to enhance civil liberty protections. In July 2005, the U.S. Senate passed a reauthorization bill with substantial changes to several of the act's sections, while the House reauthorization bill kept most of the act's original language. The two bills were then reconciled in a conference committee criticized by Senators from both the Republican and Democratic parties for ignoring civil liberty concerns.

The bill, which removed most of the changes from the Senate version, passed Congress on March 2, 2006, and was signed by President Bush on March 9 and 10 of that year.

On May 26, 2011, President Barack Obama signed the PATRIOT Sunsets Extension Act of 2011, a four-year extension of three key provisions in the Act: roving wiretaps, searches of business records, and conducting surveillance of "lone wolves"—individuals suspected of terrorist-related activities not linked to terrorist groups.

Following a lack of Congressional approval, parts of the Patriot Act expired on June 1, 2015. With passing the USA Freedom Act on June 2, 2015, the expired parts were restored and renewed through 2019. However, Section 215 of the law was amended to stop the National Security Agency (NSA) from continuing its mass phone data collection program. Instead, phone companies will retain the data and the NSA can obtain information about targeted individuals with permission from a federal court.

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