a subpoena issued under subsection (b) . (2) Order The court may issue an order requiring the person referred to in paragraph (1) to comply with a subpoena referred to in paragraph (1) . (3) Failure to obey Any failure to obey the order of the court may be punished by the court as a contempt of court. (4) Process Process in any proceeding under this subsection may be served in the United States judicial district in which the person being proceeded against resides or conducts business, or wherever the person may be found. 1311. Suspension or termination (a) Mandatory suspension or termination The Secretary shall suspend or terminate an order or a provision of an order if the Secretary finds that an order or provision of an order obstructs or does not tend to effectuate the purpose of this division, or if the Secretary determines that the order or a provision of an order is not favored by a majority of all votes cast in the referendum as provided in section 1307(a)(2). (b) Implementation of suspension or termination If, as a result of a referendum conducted under section 1307, the Secretary determines that the order is not approved, the Secretary shall— (1) not later than 180 days after making the determination, suspend or terminate, as the case may be, collection of assessments under the order