Sec. 4. 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 power 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 of the United States or territorial courts as by this act have cognizance of the offence, 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 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. Sec. 5. That said Commissioners shall have concurrent jurisdiction with the judges of the circuit and district courts of the United States, and the judges of the superior courts of the territories, severally and collectively, in term time and vacation, upon satisfactory proof being made, to issue warrants and precepts for arresting and bringing before them all offenders against the provisions of this act, and, on examination, to discharge, admit to bail, or commit them for trial, as the facts may warrant.