18 U.S.C. § 1587: Possession of slaves aboard vessel

Whoever, being the captain, master, or commander of any vessel found in any river, port, bay, harbor, or on the high seas within the jurisdiction of the United States, or hovering off the coast thereof, and having on board any person for the purpose of selling such person as a slave, or with intent to land such person for such purpose, shall be fined under this title or imprisoned not more than 10 years, or both.