By early 1966, the work of Vernon Dahmer was well known in south Mississippi. A light-skinned Black man, he was a farmer, grocery store owner, and two-time president of the Forrest County chapter of the NAACP. He and Medgar Evers founded a youth NAACP chapter in Hattiesburg, and for years after Evers's assassination Dahmer was the chief advocate for voting rights in a county where Black registration was shamelessly suppressed. This put Dahmer in...