In the case of Missouri Pacific Railroad Company v. United States (1925), the Supreme Court ruled in favor of the U.S. government, upholding an order by the Interstate Commerce Commission (ICC). The ICC had ordered several railroad companies to cease discriminatory practices against certain shippers and provide them with equal services at fair rates. The railroads argued that this was beyond ICC's authority as it interfered with their managerial discretion on how to conduct business operations efficiently. However, Justice Oliver Wendell Holmes Jr., writing for a unanimous court, held that such orders were within ICC's power under federal law aimed at preventing undue or unreasonable preferences or advantages in commerce among states. He stated that while courts should not interfere lightly with business management decisions, they must ensure compliance when regulatory bodies like ICC impose necessary restrictions to prevent discrimination and protect public interest.

In the dissenting opinion for Missouri Pacific Railroad Company v. United States, it was argued that the Interstate Commerce Commission (ICC) did not have the authority to regulate intrastate rates of railroads even if they indirectly affected interstate commerce. The dissenting justices believed that this power should be reserved for individual states and not a federal agency like ICC. They contended that allowing such regulation would lead to an overreach of federal powers into areas traditionally controlled by state governments, undermining their sovereignty and violating principles of federalism enshrined in the Constitution. Furthermore, they expressed concerns about potential negative impacts on local businesses and economies due to federally-imposed rate changes without proper consideration or understanding of specific regional conditions or needs.