10 U.S.C. §§ 331-335

Sec. 331. Federal aid for State governments

Whenever there is an insurrections in any State against its government, the President

may, upon the request of its legislature or of its governor if the legislature cannot be

convened, call into Federal service such of the militia of the other States, in the number

requested by that State, and use such of the armed forces, as he considers necessary to

suppress the insurrection.

Sec. 332. Use of militia and armed forces to enforce Federal authority

Whenever the President considers that unlawful obstructions, combinations, or

assemblages, or rebellion against the authority of the United States, make it impracticable

to enforce the laws of the United States in any State by the ordinary course of judicial

proceedings, he may call into Federal service such of the militia of any State, and use

such of the armed forces, as he considers necessary to enforce those laws or to suppress

the rebellion.

Sec. 333. Interference with State and Federal law

The President, by using the militia or the armed forces, or both, or by any other means,

shall take such measures as he considers necessary to suppress, in a State, any

insurrection, domestic violence, unlawful combination, or conspiracy, if it--

(1) so hinders the execution of the laws of that State, and of the United States

within the State, that any part or class of its people is deprived of a right, privilege,

immunity, or protection named in the Constitution and secured by law, and the

constituted authorities of that State are unable, fail, or refuse to protect that right,

privilege, or immunity, or to give that protection; or

(2) opposes or obstructs the execution of the laws of the United States or impedes

the course of justice under those laws.

In any situation covered by clause (1), the State shall be considered to have denied the

equal protection of the laws secured by the Constitution.

Sec. 334. Proclamation to disperse

Whenever the President considers it necessary to use the militia or the armed forces under

this chapter, he shall, by proclamation, immediately order the insurgents or those

obstructing the enforcement of the laws to disperse and retire peaceably to their abodes

within a limited time.

Sec. 335. Guam and Virgin Islands included as “State”
For purposes of this chapter, the term "State" includes Guam and the Virgin Islands.

https://policy.defense.gov/portals/11/documents/hdasa/references/insurrection_act.pdf