Poppe v. Langford 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 who was being held in a federal prison. The case arose when a prisoner, Poppe, was held in a federal prison in California and sought a writ of habeas corpus from the state court. The state court granted the writ, and the federal government appealed the decision to the Supreme Court. The Supreme Court held that the state court did not have the authority to issue the writ of habeas corpus. The Court reasoned that the writ of habeas corpus was a federal power, and that the state court did not have the authority to interfere with the federal government's power to imprison individuals. 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 government's power to protect this right. The Court's decision in Poppe v. Langford established that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in a federal prison. This decision has been cited in numerous cases since then, and it has been used to support the idea that the federal government has the power to protect the fundamental right of habeas corpus.

Justice Field delivered the dissenting opinion in Poppe v. Langford, arguing that the majority's decision was contrary to established precedent and would lead to unjust results. He argued that under existing law, a plaintiff could not recover damages for an injury caused by another person unless they had suffered actual damage or loss as a result of it. The majority's ruling allowed recovery even if no such harm had been suffered, which he believed was wrongfully expanding tort liability beyond what should be legally permissible. Furthermore, Justice Field noted that allowing recovery without proof of actual harm would create uncertainty in future cases and potentially open up defendants to frivolous claims from plaintiffs who have not actually been injured but are seeking compensation anyway. Ultimately, he concluded that while sympathy may exist for the plaintiff in this case due to their unfortunate circumstances, justice must still be served according to established legal principles rather than emotion-based decisions made on a case-by-case basis.