States wherein the court having jurisdiction of the cause, civil or criminal, is held, so far as the same is not inconsistent with the Constitution and laws of the United States, shall be extended to and govern said courts in the trial and disposition of such cause, and, if of a criminal nature, in the infliction of punishment on the party found guilty. "SEC. 4. _And be it further enacted_, That the district attorneys, marshals, and deputy-marshals of the United States, the commissioners appointed by the circuit and territorial courts of the United States, with powers of arresting, imprisoning, or bailing offenders against the laws of the United States, the officers and agents of the Freedmen's Bureau, and every other officer who may be specially empowered by the President of the United States, shall be, and they are hereby, specially authorized and required, at the expense of the United States, to institute proceedings against all and every person who shall violate the provisions of this act, and cause him or them 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 this act has cognizance of the offense. And with a view to affording reasonable protection to all persons in their constitutional rights of equality before the law, without distinction of race or color, or previous condition of slavery or involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, and to the prompt discharge of the duties of this act, it shall be the duty of the circuit courts of the United States and the superior courts of the Territories of the United States, from time to time, to increase the number of commissioners, so as to afford a speedy and convenient means for the arrest and examination of persons charged with a violation of this act. And such commissioners are hereby authorized and required to exercise and discharge all the powers and duties conferred on them by this act, and the same duties with regard to offenses created by this act, as they are authorized by law to exercise with regard to other offenses against the laws of the United States.