The Posse Comitatus Act of 1878 limits the use of the military in the U.S.
Police State: Posse Comitatus Act
Posse Comitatus Act (1878)
The act stated: "Whoever, except in cases and under circumstances expressly authorized by the Constitution or Act of Congress, willfully uses any part of the Army or the Air Force as a posse comitatus or otherwise to execute the laws shall be fined under this title or imprisoned not more than two years, or both."ወ፨ሮ መሐዛ አሽናፊ ጠንቀቅ ነው ይሄኔ
Congressional debates indicate that the PCA was intended to stop army troops from answering the call of a marshal to perform direct law enforcement duties and aid in execution of the law. Further legislative history indicates that the more immediate objective was to put an end to the use of federal troops to police elections in ex-Confederate states where civil power had been reestablished.