46 U.S.C. § 41106

A marine terminal operator may not— (1) agree with another marine terminal operator or with a common carrier to boycott, or unreasonably discriminate in the provision of terminal services to, a common carrier or ocean tramp; (2) give any undue or unreasonable preference or advantage or impose any undue or unreasonable prejudice or disadvantage with respect to any person; or (3) unreasonably refuse to deal or negotiate.