Sec.  204. (a) The district  courts of the  United States shall
havejurisdiction to restrain violations of section 203(a).
  (b) 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.
[42 U.S.C. 7523]