46 U.S.C. § 10508: General penalties

(a) A master who carries a seaman on a voyage without first making the agreement required by section 10502 of this title shall pay to the seaman the highest wage that was paid for a similar voyage within the 3 months before the time of engagement at the port or place at which the seaman was engaged. A seaman who has not signed an agreement is not bound by the applicable regulations, penalties, or forfeitures. (b) A master engaging a seaman in violation of this chapter or a regulation prescribed under this chapter is liable to the United States Government for a civil penalty of not more than $5,000. The vessel also is liable in rem for the penalty.