In the case of Federal Power Commission v. Hunt et al., 1963, the Supreme Court ruled on a dispute between natural gas companies and the Federal Power Commission (FPC). The FPC had ordered these companies to refund certain amounts they had collected from their customers in excess of rates approved by the commission. The gas companies argued that this order was beyond FPC's authority as it violated their rights under Fifth Amendment due process clause because it retroactively changed agreed upon contract terms without providing an opportunity for judicial review before enforcement. However, the Supreme Court disagreed with this argument and upheld FPC's order stating that there was no violation of constitutional rights since Congress granted such powers to regulate interstate commerce to agencies like FPC through Natural Gas Act which includes ability to determine just and reasonable rates even retrospectively if necessary.

In the dissenting opinion for Federal Power Commission v. Hunt, it was argued that the majority's decision to uphold the Federal Power Commission's (FPC) authority over natural gas producers selling directly to industrial consumers contradicted previous court rulings and exceeded Congress' intent when creating the Natural Gas Act. The dissenters believed that this interpretation of FPC jurisdiction would lead to an unnecessary expansion of federal regulatory power into areas traditionally governed by state law. They also expressed concern about potential negative impacts on small businesses and local economies due to increased federal regulation in these markets. Furthermore, they disagreed with the majority’s view that direct sales were part of interstate commerce subject to FPC oversight, arguing instead such transactions should be considered intrastate activities outside FPC control.