In the case of Huffman et al. v. Pursue, Ltd., 1974, the U.S Supreme Court ruled that federal courts should abstain from hearing a civil case when there is an ongoing state proceeding involving the same matter. The dispute began when Ohio officials closed down a theater owned by Pursue Ltd., alleging it was showing obscene films in violation of state law. When Pursue sought relief in federal court claiming its First Amendment rights were violated, Ohio officials argued that since they had already initiated proceedings at the state level to close down the theater for violating obscenity laws, this issue should be resolved there first before any federal intervention could take place. The Supreme Court agreed with Ohio's argument and held that principles of equity, comity and federalism warranted abstention in deference to ongoing state proceedings even if those proceedings were not criminal prosecutions per se but rather "civil enforcement" actions brought by states against individuals or entities accused of violating their laws. This decision expanded on previous rulings which mandated such abstention only during pending criminal cases; now it applied also to certain civil cases where states are seeking to enforce their own public nuisance laws against parties who then seek refuge under constitutional claims in federal courts.

In the dissenting opinion for Huffman et al. v. Pursue, Ltd., Justice Brennan argued that the majority's decision to allow federal courts to abstain from hearing a case due to ongoing state proceedings was an overreach of their authority and violated principles of federalism. He contended that this ruling could potentially undermine individuals' rights by denying them access to a federal forum where they can raise constitutional claims against state actions. Furthermore, he expressed concern about the potential for inconsistent rulings between state and federal courts on similar issues if such abstention were allowed regularly. In his view, it is essential for maintaining balance in our dual court system that litigants have equal access to both forums without undue interference or restriction imposed by either one.