Process other than a summons as provided in Rule 4 or subpoena as provided in Rule 45 shall be served by a United States marshal, a deputy United States marshal, or a person specially appointed for that purpose, who shall make proof of service as provided in Rule 4(1). The process may be served anywhere within the territorial limits of the state in which the district court is located, and, when authorized by a statute of the United States, beyond the territorial limits of that state.
(b) Enforcement of Orders: Commitment for Civil Contempt.
An order of civil commitment of a person held to be in contempt of a decree or injunction issued to enforce the laws of the United States may be served and enforced in any district. Other orders in civil contempt proceedings shall be served in the state in which the court issuing the order to be enforced is located or elsewhere within the United States if not more than 100 miles from the place at which the order to be enforced was issued.