Rosa Parks was a leader in the Montgomery, Alabama, bus boycott, which demonstrated that segregation would be contested in many social settings. A federal district court decided that segregation on publicly operated buses was unconstitutional and concluded that, “in the Brown case, Plessy v. Ferguson has been impliedly, though not explicitly, overruled.” The Supreme Court affirmed the judgment of the district court without opinion, a common procedure it followed in the interim between 1954 and 1958.