"The inside story of how a courageous FBI informant helped to bring down the KKK chapter responsible for a brutal civil rights-era killing. By early 1966, the civil rights work of Vernon Dahmer, head of the Forrest County chapter of the NAACP and a dedicated advocate for voter registration, was well-known in Mississippi. This put him in the crosshairs of the White Knights, one of the most violent sects of the KKK in the South-which carried out his...