Posse Comitatus Act

United States law limiting use of the federal military in domestic policy

The Posse Comitatus Act is a United States federal law signed on June 18, 1878, by President Rutherford B. Hayes that limits the powers of the federal government in the use of federal military personnel to enforce domestic policies within the United States. Congress passed the Act as an amendment to an army appropriation bill following the end of Reconstruction and updated it in 1956, 1981 and 2021.

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