Mob violence at criminal trials, such as those that followed the Elaine massacre, is a violation of due process. First 20th-century case where the Court protected the rights of Blacks in the South, and one of its first to review a criminal conviction for constitutionality. Decided February 19, 1923 (argued January 9, 1923). Opinion of the Court: Oliver Wendell Holmes → go there Dissenting: McReynolds. Applied: the Fourteenth Amendment → go there Topic: Other areas. Moore et al. v. Dempsey, 261 U.S. 86 (1923), was a United States Supreme Court case in which the Court ruled 6–2 that the defendants' mob-dominated trials deprived them of due process guaranteed by the Due Process Clause of the Fourteenth Amendment. It reversed the district court's decision declining the petitioners' writ of habeas corpus. Wiki link