From 18 USC§ 962
§ 962. Arming vessel against friendly nation
Whoever, within the United States, furnishes, fits out, arms, or attempts to furnish, fit out or arm, any vessel, with intent that such vessel shall be employed in the service of any foreign prince, or state, or of any colony, district, or people, to cruise, or commit hostilities against the subjects, citizens, or property of any foreign prince or state, or of any colony, district, or people with whom the United States is at peace; or
Whoever issues or delivers a commission within the United States for any vessel, to the intent that she may be so employed—
Shall be fined under this title or imprisoned not more than three years, or both.
Every such vessel, her tackle, apparel, and furniture, together with all materials, arms, ammunition, and stores which may have been procured for the building and equipment thereof, shall be forfeited, one half to the use of the informer and the other half to the use of the United States.
Does the Audacity of Dopes and other Flotilla participants violate this clause? Time to look into this, doncha think?