Each District Court appoints a convenient number of District Court Commissioners, who issue warrants of arrest on criminal proceedings, take bail, inquire whether there is probable cause to hold the accused to answer to the charge in court, and discharge in such respects substantially the functions generally belonging to justices of the peace in the States. * * * * * CHAPTER X RELATIONS OF THE STATE JUDICIARY TO THE UNITED STATES AND OF THE UNITED STATES JUDICIARY TO THE STATES Every judicial officer of a State is required by the Constitution of the United States to bind himself by oath or affirmation to support it, and this obligation compels him to respect every Act of Congress made in pursuance of the Constitution, and every treaty made under the authority of the United States, as, in case of conflict, superior to anything in his State Constitution or laws. The courts of the national government are complementary to those of the States. Both belong to one judicial system. Rights arising under the laws of the United States may be enforced by a State court as well as by a federal court, and rights arising under a State law by a federal as well as by the State court, unless in cases where there is some special restriction upon its jurisdiction. Such a restriction may be imposed by either government, as respects any right which it creates. The judicial power of the United States extends only to certain classes of cases. As to some of these it is necessarily exclusive: as to any of the rest Congress can make it such.[Footnote: The Moses Taylor, 4 Wallace's Reports, 411, 429.] On the other hand Congress may assume to invest a State court with power to dispose of a certain matter of federal right, and the State may decline to permit the exercise of such a power. The United States cannot in that manner compel the courts of another government to do their bidding. It would tend to throw on the States a greater burden than they might deem necessary or proper. They provide courts to meet the wants of those looking to their own sovereignties for justice. Thus, although nothing could seem more anomalous than for one sovereignty to confer citizenship in another, the laws of the United States allow naturalization to be obtained by proceedings in State courts. Most aliens who become citizens of the United States do so in that way, because the State courts are more easy of access. But a State can at any time restrict or forbid the use of its courts for such a purpose.[Footnote: Stephens, petitioner, 4 Gray's (Mass.) Reports, 559; State _v._ Judges, 58 N. J. Law Reports, 97; 32 Atlantic Reporter, 743.]