18 U.S.C. § 1652 : US Code - Section 1652: Citizens as pirates

Search 18 U.S.C. § 1652 : US Code - Section 1652: Citizens as pirates

Whoever, being a citizen of the United States, commits any murder
or robbery, or any act of hostility against the United States, or
against any citizen thereof, on the high seas, under color of any
commission from any foreign prince, or state, or on pretense of
authority from any person, is a pirate, and shall be imprisoned for
life.