18 U.S.C. § 1653 : US Code - Section 1653: Aliens as pirates

Search 18 U.S.C. § 1653 : US Code - Section 1653: Aliens as pirates

Whoever, being a citizen or subject of any foreign state, is
found and taken on the sea making war upon the United States, or
cruising against the vessels and property thereof, or of the
citizens of the same, contrary to the provisions of any treaty
existing between the United States and the state of which the
offender is a citizen or subject, when by such treaty such acts are
declared to be piracy, is a pirate, and shall be imprisoned for
life.