In the 1959 case American Trucking Associations, Inc., et al. v. United States et al., the U.S Supreme Court ruled on a dispute involving trucking companies and their rates for transporting agricultural commodities. The Interstate Commerce Commission (ICC) had previously approved lower rates for these goods compared to general commodities, which was challenged by the American Trucking Associations (ATA). They argued that this constituted unfair discrimination under Section 3(1) of the Interstate Commerce Act. However, in its decision, the Supreme Court upheld ICC's authority to approve such rate differentials if they were found just and reasonable based on evidence presented during hearings before it. The court held that ATA failed to show how these differentials adversely affected them or led to preferential treatment of any particular person or locality as prohibited by law.

In the dissenting opinion for the American Trucking Associations, Inc., et al. v. United States et al., case in 1959, it was argued that the majority's decision to uphold an order by the Interstate Commerce Commission (ICC) allowing railroads to own and operate truck lines was a departure from established principles of administrative law. The dissenters believed that ICC had failed to provide sufficient evidence or reasoning for its conclusion that such ownership would be in public interest and not detrimental to competition within transportation industry. They also criticized ICC’s reliance on general economic theory about integration rather than specific facts of each individual case when making their decisions. Furthermore, they contended that this ruling could potentially lead to monopolistic practices as large railroad companies might use their financial power to drive independent truck operators out of business.