to common carriers subject to the Communications Act of 1934 ( 47 U.S.C. 151 et seq. ) and Acts amendatory thereof and supplementary thereto. (b) Enforcement by State attorneys general (1) In general (A) Civil actions In any case in which the attorney general of a State has reason to believe that an interest of the residents of that State has been or is threatened or adversely affected by the engagement of any person in a practice that violates this Act or a regulation prescribed under this Act, the State, as parens patriae, may bring a civil action on behalf of the residents of the State in a district court of the United States of appropriate jurisdiction to— (i) enjoin that practice