39 C.F.R. § 3013.16
Enforcement of subpoenas
In the case of contumacy or failure to obey a subpoena issued under this subpart, the Commission may apply for an order to enforce its subpoena as permitted by 39 U.S.C. 504(f)(3).
In the case of contumacy or failure to obey a subpoena issued under this subpart, the Commission may apply for an order to enforce its subpoena as permitted by 39 U.S.C. 504(f)(3).