Curtis Wilkie, author of "When Evil Lived in Laurel: the 'White Knights' and the murder of Vernon Dahmer." The book focuses on the virulent activity of an especially violent faction of the Ku Klux Klan, the local black activist they murdered, and a man - Tom Landrum - who agreed to become a member of the KKK in order to serve as an unpaid FBI informant. <postponed from last week>