In the case of Railway Mail Association v. Corsi, the U.S. Supreme Court ruled in 1944 that a New York state law prohibiting racial discrimination by labor unions did not infringe upon the First Amendment rights of union members. The Railway Mail Association had argued that their right to freedom of association was violated by being forced to accept African-American workers as members under this law. However, the court held that states have broad power under their police powers to prevent racial discrimination and promote public welfare, which includes ensuring equal opportunities for all citizens regardless of race or color in employment matters. Therefore, they concluded that such laws do not violate constitutional freedoms but rather protect them by preventing discriminatory practices.

In the dissenting opinion for Railway Mail Association v. Corsi, Justice Robert H. Jackson argued that the majority's decision to uphold a New York law prohibiting racial discrimination by labor unions was an overreach of federal power and violated states' rights. He contended that while he personally abhorred racial discrimination, it was not within the purview of the Supreme Court or Congress to regulate private organizations such as labor unions in this manner. Instead, he believed these issues should be left up to individual states and their legislatures to decide upon based on their own social and economic conditions. Furthermore, Justice Jackson expressed concern about potential unintended consequences of this ruling; specifically, forcing integration could potentially lead to more hostility between races rather than lessening it.