SEC. 2. That any person who shall violate the foregoing section by denying to any citizen, except for reasons by law applicable to citizens of every race and color, and regardless of any previous condition of servitude, the full enjoyment of any of the accommodations, advantages, facilities, or privileges in said section enumerated, or by aiding or inciting such denial, shall, for every such offence, forfeit and pay the sum of five hundred dollars to the person aggrieved thereby, to be recovered in an action of debt, with full costs; and shall also, for every such offence, be deemed guilty of a misdemeanor, and, upon conviction thereof, shall be fined not less than five hundred nor more than one thousand dollars, or shall be imprisoned not less than thirty days nor more than one year; _provided_, that all persons may elect to sue for the penalty aforesaid or to proceed under their rights at common law and by State statutes; and having so elected to proceed in the one mode or the other, their right to proceed in the other jurisdiction shall be barred. But this proviso shall not apply to criminal proceedings, either under this act or the criminal law of any State; _and provided further_, that a judgment for the penalty in favor of the party aggrieved, or a judgment upon an indictment, shall be a bar to either prosecution respectively. SEC. 3. That the district and circuit courts of the United States shall have, exclusively of the courts of the several States, cognizance of all crimes and offences against, and violations of, the provisions of this act; and actions for the penalty given by the preceding section may be prosecuted in the territorial, district, or circuit courts of the United States wherever the defendant may be found, without regard to the other party; and the district attorneys, marshals, and deputy marshals of the United States, and commissioners appointed by the circuit and territorial courts of the United States, with powers of arresting and imprisoning or bailing offenders against laws of the United States, are hereby specially authorized and required to institute proceedings against every person who shall violate the provisions of this act, and cause him to be arrested and imprisoned or bailed, as the case may be, for trial before such court of the United States, or territorial court, as by law has cognizance of the offence except in respect of the right of action accruing to the person aggrieved; and such district attorneys shall cause such proceedings to be prosecuted to their termination as in other cases; _provided_, that nothing contained in this section shall be construed to deny or defeat any right of civil action accruing to any person, whether by reason of this act or otherwise; and any district attorney who shall wilfully fail to