In Thomas v. City of Richmond, the Supreme Court of the United States was asked to decide whether a city ordinance that prohibited the sale of alcoholic beverages was constitutional. The plaintiff, Thomas, was a saloonkeeper who had been convicted of violating the ordinance. He argued that the ordinance violated his right to due process of law under the Fourteenth Amendment. The Supreme Court held that the ordinance was constitutional. The Court reasoned that the ordinance was a valid exercise of the police power of the state, and that it did not violate Thomas' right to due process of law. The Court noted that the ordinance was a reasonable regulation of the sale of alcoholic beverages, and that it was not an arbitrary or oppressive exercise of power. The Court also held that the ordinance did not violate Thomas' right to equal protection of the laws. The Court noted that the ordinance was a valid exercise of the police power of the state, and that it was not an arbitrary or oppressive exercise of power. The Court also noted that the ordinance was not discriminatory, and that it applied equally to all persons. In conclusion, the Supreme Court held that the ordinance was constitutional, and that it did not violate Thomas' right to due process of law or his right to equal protection of the laws.

Justice Field delivered the dissenting opinion in Thomas v. City of Richmond, arguing that the majority's decision was an unconstitutional infringement on state sovereignty and a violation of the Tenth Amendment to the United States Constitution. He argued that Congress had no authority to pass legislation regulating municipal corporations, as it is not one of its enumerated powers under Article I Section 8. Furthermore, he argued that even if Congress did have such power, this particular law would be invalid because it attempted to regulate matters which are within states' exclusive jurisdiction - namely taxation and local government organization. Justice Field concluded by asserting that any attempt by Congress to interfere with these issues would be a direct violation of state sovereignty and thus unconstitutional according to both precedent set forth in previous Supreme Court cases as well as principles outlined in the Tenth Amendment itself.