This is suddenly topical
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The Insurrection Act of 1807 is a United States federal law (10 U.S.C. §§ 251–255; prior to 2016, 10 U.S.C. §§ 331–335) that empowers the president of the United States to deploy U.S. military and federalized National Guard troops within the United States in particular circumstances, such as to suppress civil disorder, insurrection and rebellion.
The act provides the "major exception" to the Posse Comitatus Act, which limits the use of the U.S. military within the United States for law enforcement purposes.[1] The President must firstly issue a proclamation ordering the insurgents to immediately disperse (per 10 U.S.C. § 254).
This is the original text of the act.
An Act authorizing the employment of the land and naval forces of the United States, in cases of insurrections
Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That in all cases of insurrection, or obstruction to the laws, either of the United States, or of any individual state or territory, where it is lawful for the President of the United States to call forth the militia for the purpose of suppressing such insurrection, or of causing the laws to be duly executed, it shall be lawful for him to employ, for the same purposes, such part of the land or naval force of the United States, as shall be judged necessary, having first observed all the pre-requisites of the law in that respect.
APPROVED, March 3, 1807.