In the case of Hoover Motor Express Co., Inc. v. United States in 1957, the Supreme Court ruled on a dispute involving interstate commerce regulations and their application to motor carriers. The Interstate Commerce Commission (ICC) had issued an order requiring certain trucking companies, including Hoover Motor Express Co., to keep detailed records of all service performed under temporary authorizations granted by ICC during World War II and Korean War emergencies. These records were needed for determining whether these services should be included in the carrier's permanent operating authority or not. Hoover challenged this order arguing that it was beyond ICC’s statutory power as it required them to maintain records retroactively from years before when no such requirement existed at that time. However, the Supreme Court upheld ICC's decision stating that its demand was within its powers given by Congress under Part II of Interstate Commerce Act which allows it broad discretion in supervising and regulating motor carriers engaged in interstate commerce.

The dissenting opinion in the case of Hoover Motor Express Co., Inc. v. United States argued that the Interstate Commerce Commission (ICC) had overstepped its authority by imposing a requirement for motor carriers to maintain detailed records of their operations, including hours worked and wages paid to drivers. The dissenters believed that this mandate was not within the ICC's power as granted by Congress under existing legislation, specifically pointing out that such record-keeping requirements were not explicitly mentioned in any relevant statutes. They also expressed concern about potential violations of privacy rights due to excessive government intrusion into private business affairs through these reporting obligations.