In the United States v. Schoverling case of 1892, the Supreme Court ruled on a matter concerning import duties. The defendant, D.M. Schoverling & Co., imported gun barrels from England and argued that they should be classified as "gun wares" under customs law, which would impose a lower duty rate than if they were considered complete guns or parts thereof. However, the U.S government contended that these items should be categorized as parts of guns and thus subject to higher import duties. The court sided with the government's interpretation of customs laws in this instance. It held that while gun barrels alone could not function as firearms without other components such as stocks and locks, their primary purpose was still for use in constructing firearms; therefore classifying them under 'parts of guns' was appropriate. This decision underscored how specific goods are categorized can significantly impact their associated tariffs - an important consideration for businesses involved in international trade.

In the dissenting opinion for United States v. Schoverling, it was argued that the federal government did not have jurisdiction over this case as it involved a purely internal matter of a state. The dissenting justices believed that Congress had exceeded its constitutional authority by attempting to regulate trade within individual states under the guise of regulating interstate commerce. They maintained that while Congress has broad powers to regulate interstate commerce, those powers do not extend to intrastate activities unless they substantially affect interstate commerce. In their view, allowing such an extension would effectively eliminate any limits on federal power and undermine principles of federalism and state sovereignty enshrined in the Constitution.