United States v. Eckford was a United States Supreme Court case that dealt with the issue of whether a federal court had the power to issue a writ of habeas corpus to a state court. The case arose when a man named John Eckford was arrested in the state of New York for a crime he allegedly committed in the state of Pennsylvania. Eckford sought a writ of habeas corpus from the federal court in order to challenge his arrest and confinement. The Supreme Court held that the federal court did not have the power to issue a writ of habeas corpus to a state court. The Court reasoned that the writ of habeas corpus was a remedy that was available only to federal courts, and that the federal court did not have the power to interfere with the proceedings of a state court. The Court also held that the writ of habeas corpus was not available to challenge the legality of a state court's decision. The Court concluded that the federal court did not have the power to issue a writ of habeas corpus to a state court, and that the writ of habeas corpus was not available to challenge the legality of a state court's decision.

In United States v. Eckford, the Supreme Court was tasked with determining whether a federal court had jurisdiction to hear an appeal from a state court decision in which the defendant was found guilty of violating a state law prohibiting the sale of liquor without license. The majority opinion held that because Congress had not granted authority for such appeals, it did not have jurisdiction and therefore could not hear this case. Justice Field dissented on the basis that he believed Congress should be able to grant appellate jurisdiction over cases involving violations of both federal and state laws when necessary to protect citizens’ rights under either body of law. He argued that allowing appeals would ensure uniformity between states by preventing one state’s interpretation or application of its own laws from conflicting with another's, as well as provide protection against any potential abuses by local courts who may be biased against certain individuals or groups due to their race or other factors unrelated to justice itself.