In the case of Elrod v. Burns, the U.S. Supreme Court ruled in 1976 that it was unconstitutional for public employees to be dismissed or threatened with dismissal based on their political affiliations unless such affiliation interfered with their job performance. The case arose when a newly elected Democratic sheriff in Cook County, Illinois fired several Republican deputy sheriffs and replaced them with Democrats. The deputies sued, arguing that this violated their First Amendment rights to freedom of association and belief as well as Fourteenth Amendment right to equal protection under law. In a 5-4 decision led by Justice Brennan, the court held that patronage dismissals (dismissals due to political beliefs) were only justified if they furthered "vital government interests." This ruling significantly limited politically motivated firings within public employment.

In the dissenting opinion for Elrod v. Burns, Justice Powell argued that political patronage does not necessarily infringe upon First Amendment rights and can be a legitimate tool in fostering party unity and ensuring effective governance. He contended that the majority's decision failed to acknowledge the historical role of patronage in American politics and its potential benefits. Furthermore, he expressed concern over judicial intrusion into political processes which could lead to an unmanageable expansion of litigation against public officials. He also disagreed with the majority's view on dismissing employees based on their political affiliations, arguing it is not always unconstitutional as long as it doesn't coerce or punish individuals for their beliefs but rather serves a valid governmental purpose like promoting efficiency and integrity in public service.