This being rejected by the Missouri court, there was no case before it, or least it was a case with only one side. And this is the case which, in the opinion of this court, we are bound to follow. The Missouri court disregards the express provisions of an act of Congress and the Constitution of a sovereign State, both of which laws for twenty-eight years it had not only regarded, but carried into effect. If a State court may do this, on a question involving the liberty of a human being, what protection do the laws afford? So far from this being a Missouri question, it is a question, as it would seem, within the twenty-fifth section of the judiciary act, where a right to freedom being set up under the act of Congress, and the decision being against such right, it may be brought for revision before this court, from the Supreme Court of Missouri. I think the judgment of the court below should be reversed. * * * * * Mr. Justice CURTIS dissenting. I dissent from the opinion pronounced by the Chief Justice, and from the judgment which the majority of the court think it proper to render in this case. The plaintiff alleged, in his declaration, that he was a citizen of the State of Missouri, and that the defendant was a citizen of the State of New York. It is not doubted that it was necessary to make each of these allegations, to sustain the jurisdiction of the Circuit Court. The defendant denied, by a plea to the jurisdiction, either sufficient or insufficient, that the plaintiff was a citizen of the State of Missouri. The plaintiff demurred to that plea. The Circuit Court adjudged the plea insufficient, and the first question for our consideration is, whether the sufficiency of that plea is before this court for judgment, upon this writ of error. The part of the judicial power of the United States, conferred by Congress on the Circuit Courts, being limited to certain described cases and controversies, the question whether a particular case is within the cognizance of a Circuit Court, may be raised by a plea to the jurisdiction of such court. When that question has been raised, the Circuit Court must, in the first instance, pass upon and determine it. Whether its determination be final, or subject to review by this appellate court, must depend upon the will of Congress; upon which body the Constitution has conferred the power, with certain restrictions, to establish inferior courts, to determine their jurisdiction, and to regulate the appellate power of this court. The twenty-second section of the judiciary act of 1789, which allows a writ of error from final judgments of Circuit Courts, provides that there shall be no reversal in this court, on such writ of error, for error in ruling any plea in abatement, _other than a plea to the jurisdiction of the court_. Accordingly it has been held, from the origin of the court to the present day, that Circuit Courts have not