Williams v. Reynolds was a United States Supreme Court case that dealt with the issue of whether a state court had the authority to issue a writ of habeas corpus to a prisoner held in federal custody. The case arose when a prisoner, John Williams, was held in federal custody in the state of Virginia. Williams sought a writ of habeas corpus from the state court, which the court granted. The federal government then appealed the decision to the Supreme Court. The Supreme Court held that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in federal custody. The Court reasoned that the writ of habeas corpus was a federal prerogative, and that the state court did not have the authority to interfere with the federal government's power to detain a prisoner. The Court also noted that the writ of habeas corpus was a fundamental right, and that the federal government had the right to protect its own interests in this matter. The Court's decision in Williams v. Reynolds established that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in federal custody. This decision has been cited in numerous cases since then, and has been used to support the idea that the federal government has the right to protect its own interests in matters of detention.

In Williams v. Reynolds, the Supreme Court was asked to decide whether a state court had jurisdiction over an action brought by a citizen of one state against another in which the defendant resided in yet another state. The majority opinion held that it did not have such jurisdiction and dismissed the case. However, Justice Field dissented from this decision, arguing that under Article III of the Constitution and its interpretation by prior decisions of the Court, states do indeed possess concurrent jurisdiction with federal courts over cases involving citizens of different states when they are properly invoked before them. He further argued that Congress has no power to limit or restrict this authority granted to states by Article III as long as those actions are consistent with due process requirements established therein. Finally, he noted that even if there were some doubt about whether or not such powers existed within individual states’ jurisdictions at common law (as suggested by Chief Justice Chase), it should be assumed for purposes of deciding this case since no evidence was presented on either side regarding their respective positions on this issue.