Kahn v. Smelting Company was a United States Supreme Court case that addressed the issue of whether a state court could enjoin a federal court from hearing a case. The plaintiff, Kahn, had filed a suit in a federal court against the defendant, Smelting Company, for damages resulting from a breach of contract. The defendant then filed a motion in a state court to enjoin the federal court from hearing the case. The Supreme Court held that the state court did not have the authority to enjoin the federal court from hearing the case. The Court reasoned that the state court was not a court of competent jurisdiction to enjoin the federal court from hearing the case, and that the state court was not authorized to interfere with the proceedings of the federal court. The Court further held that the state court was not authorized to interfere with the proceedings of the federal court, and that the state court was not authorized to interfere with the proceedings of the federal court. The Court concluded that the state court was not authorized to enjoin the federal court from hearing the case.

Justice Field delivered the dissenting opinion in Kahn v. Smelting Company, arguing that the majority's decision was contrary to established law and precedent. He argued that a contract between two parties should be enforced according to its terms unless there is evidence of fraud or mistake, which he did not believe existed in this case. Furthermore, he noted that it would be unfair for one party to benefit from their own breach of contract by claiming damages when they had already received payment for services rendered under the agreement. In conclusion, Justice Field believed that enforcing contracts as written was essential for maintaining trust and confidence among contracting parties and urged his colleagues on the court to reconsider their ruling accordingly.