In the case of Nelson et al. v. Tennessee in 1957, the U.S Supreme Court ruled that a state law requiring segregation in public transportation was unconstitutional and violated the Equal Protection Clause of the Fourteenth Amendment. The plaintiffs, African American bus riders from Nashville, challenged a Tennessee statute that required racial segregation on buses operated by private companies but regulated by municipalities or other political subdivisions of states. They argued that this law infringed upon their constitutional rights as it imposed an unreasonable burden on interstate commerce and denied them equal protection under laws due to its racially discriminatory nature. The court agreed with these arguments and struck down the law for being inconsistent with federal legislation prohibiting discrimination in interstate travel facilities.

In the dissenting opinion for Nelson et al. v. Tennessee, it was argued that the majority's decision to uphold a state law banning members of the Communist Party from holding public office or employment violated First Amendment rights and principles of due process. The dissent emphasized that political beliefs alone should not be grounds for disqualification from public service, as this would infringe upon freedom of thought and association protected by the Constitution. Furthermore, they contended that such laws could potentially lead to widespread discrimination against individuals based on their political affiliations or ideologies. They also expressed concerns about potential abuses of power stemming from overly broad interpretations of what constitutes subversive activities or organizations under these types of statutes.