Congress is granted the power to pass laws about piracy in Article 1, Section 8 of the U.S. Constitution.
For more:
Clause 10 Maritime Crimes
To define and punish Piracies and Felonies committed on the high Seas, and Offences against the Law of Nations;
- ArtI.S8.C10.1 Historical Background on Maritime Crimes
- ArtI.S8.C10.2 Definition of Maritime Crimes and Offenses
- ArtI.S8.C10.3 Extraterritorial Reach