Kemper v. Churchill 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, Churchill, was held in federal custody in the state of Missouri. The state court issued a writ of habeas corpus to the federal court, ordering the release of Churchill. The federal court refused to comply with the writ, arguing that the state court did not have the authority to issue such a writ. The Supreme Court ultimately 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 court's jurisdiction. The Court also noted that the writ of habeas corpus was a fundamental right, and that the state court should not be allowed to interfere with the federal court's exercise of that right. In conclusion, 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 should not be allowed to interfere with the federal court's exercise of that right.

In Kempner v. Churchill, the Supreme Court was tasked with determining whether a judgment rendered in Texas could be enforced against an individual who had moved to California after the judgment was issued. The majority opinion held that such judgments were not enforceable outside of their state of origin and thus denied enforcement of the Texas court's decision in California. Justice Field dissented from this ruling, arguing that states should recognize each other’s judicial decisions as valid and binding on individuals regardless of where they reside or move to afterwards. He argued that if states did not do so it would lead to chaos and confusion among citizens who may have been subject to different laws depending on which state they resided in at any given time. Furthermore, he noted that there is no constitutional basis for refusing recognition between two sister-states; rather it is based solely upon comity between them - something which can only be achieved through mutual respect for one another’s legal systems and decisions made therein.