In the case of California Motor Transport Co. et al. v. Trucking Unlimited et al., trucking companies in California alleged that their competitors were conspiring to monopolize the transportation industry by maliciously filing repetitive and baseless applications with regulatory agencies, intending to exhaust their financial resources through legal fees. The defendants argued they were protected under Noerr-Pennington doctrine, which shields individuals from liability for petitioning any branch of government. However, the Supreme Court ruled unanimously against them stating that access to administrative and judicial proceedings are basic civil rights; therefore, a conspiracy to deter others from accessing these could be considered an antitrust violation if it resulted in economic injury or monopoly control over a market sector.

The dissenting opinion in the case of California Motor Transport Co. v. Trucking Unlimited argued that the majority's decision to extend Noerr-Pennington doctrine, which protects efforts to petition government from antitrust liability, was misguided and overly broad. The dissenters believed that this extension could potentially shield a wide range of anti-competitive behaviors under the guise of "petitioning" activities, thereby undermining competition laws' purpose and effectiveness. They also expressed concern over potential abuse by powerful entities who might use repeated litigation as a weapon against competitors rather than for legitimate dispute resolution purposes - effectively using courts as tools for monopolistic practices instead of justice administration bodies.