42 USC 7523 - Actions to restrain violations

(a) Jurisdiction 
The district courts of the United States shall have jurisdiction to restrain violations of section 7522 (a) of this title.
(b) Actions brought by or in name of United States; subpenas 
Actions to restrain such violations shall be brought by and in the name of the United States. In any such action, subpenas for witnesses who are required to attend a district court in any district may run into any other district.