In the case of United States et al. v. Capital Transit Co. et al., 1944, the U.S Supreme Court ruled in favor of the federal government's right to regulate interstate commerce and its ability to impose labor regulations on private companies involved in such commerce. The dispute arose when Capital Transit Company, a Washington D.C.-based public transportation company, challenged an order from National War Labor Board (NWLB) that required it to increase wages for its employees as part of wartime wage stabilization efforts during World War II. The transit company argued that NWLB lacked jurisdiction over them because they operated solely within one state and did not engage directly in interstate commerce. However, the court disagreed with this argument stating that even though their operations were local, they still had significant impact on interstate commerce due to their role in transporting war workers and military personnel around nation’s capital city which was crucial for war effort at home front during WWII period. The decision affirmed broad interpretation of Commerce Clause under Constitution giving Congress power over activities having substantial relation or effect on interstate trade regardless if these are conducted entirely within boundaries of single state thus reinforcing federal authority over national economy.

In the dissenting opinion for the United States v. Capital Transit Co., it was argued that the Supreme Court overstepped its boundaries by intervening in a labor dispute, which should have been left to Congress or administrative agencies to resolve. The dissenting justices believed that this case did not involve any constitutional issues and thus, was outside of their jurisdiction. They also expressed concern about how this decision could set a precedent for future interference in private business matters by the court system. Furthermore, they disagreed with majority's interpretation of "national defense" as including public transportation systems during wartime; arguing instead that such an expansive definition would give too much power to federal courts at expense of state rights and individual liberties.