The Supreme Court refused to hear their appeals until 1956, when it agreed to hear the appeal of the California defendants; this led to the landmark Yates v. United States decision.[1][147] Fourteen second-tier CPUSA officials from California who had been convicted of Smith Act violations appealed, and on June 17, 1957, known as "Red Monday", the Supreme Court reversed their convictions. By the time the Court ruled 6–1 in Yates v. United States, four of the Supreme Court Justices who had supported the 1951 Dennis decision had been replaced, including Chief Justice Vinson.