Whenever the Attorney General receives a complaint in writing signed by an individual to the effect that he is being deprived of or threatened with the loss of his right to the equal protection of the laws, on account of his race, color, religion, or national origin, by being denied equal utilization of any public facility which is owned, operated, or managed by or on behalf of any State or subdivision thereof, other than a public school or public college as defined in section 2000c of this title, and the Attorney General believes the complaint is meritorious and certifies that the signer or signers of such complaint are unable, in his judgment, to initiate and maintain appropriate legal proceedings for relief and that the institution of an action will materially further the orderly progress of desegregation in public facilities, the Attorney General is authorized to institute for or in the name of the United States a civil action in any appropriate district court of the United States against such parties and for such relief as may be appropriate, and such court shall have and shall exercise jurisdiction of proceedings instituted pursuant to this section. The Attorney General may implead as defendants such additional parties as are or become necessary to the grant of effective relief hereunder.