In the case of Hunt et al., Co-Partners Trading as Hunt's Motor Freight & Food Products Transport, v. Crumboch et al., 1944, the US Supreme Court ruled on a dispute involving interstate commerce and labor relations. The Hunts owned a trucking company that transported goods between states and were sued by their employees for violating Pennsylvania’s minimum wage law. The Hunts argued that they should be exempt from state laws because they engaged in interstate commerce which is regulated by federal law under the Commerce Clause of the Constitution. However, the court disagreed with this argument stating that while Congress has power to regulate wages in interstate transportation industry through its control over interstate commerce, it had not exercised such authority at this time leaving room for state regulation. Therefore, since there was no conflicting federal legislation or policy regarding wages in place at this time, Pennsylvania’s minimum wage law could apply to workers involved in both intrastate and interstate transport.

In the dissenting opinion for Hunt v. Crumboch, Justice Robert H. Jackson argued that the majority's decision to uphold Pennsylvania's Milk Control Act was a departure from established constitutional principles and an overreach of state power. He contended that the law interfered with interstate commerce by imposing price controls on milk products transported across state lines, which he believed should be regulated solely by federal authorities under the Commerce Clause of the U.S Constitution. Furthermore, he expressed concern about potential economic consequences resulting from such laws, including market distortions and increased costs for consumers due to artificial price inflation caused by government intervention in free markets.