3. Orders issued by the FMC are enforceable only by federal court order. The Shipping Act sets out the mechanisms by which FMC orders may be enforced. The Shipping Act authorizes private parties to bring specified types of enforcement actions. The Act provides that "any party injured" by a violation of a nonreparation order or FMC subpoena "may seek enforcement by a United States district court having jurisdiction over the parties," 46 U.S.C. app. 1713(c), and it authorizes "the person to whom [a reparation award] was made" to seek enforcement of the order "in a United States district court having jurisdiction of the parties," 46 U.S.C. app. 1713(d)(1). The Act also authorizes the Attorney General of the United States to bring an action in federal district court to enforce various categories of FMC orders, including nonreparation orders and subpoenas. See 46 U.S.C. app. 1713(c).