Cindy Henry McMahon’s family history is a slide show of the turbulent South: a thwarted lynch mob on a Georgia preacher’s front porch; the integration of Mercer University and Macon, Georgia’s Vineville Baptist Church; Birmingham, 1963; Martin Luther King, Jr.’s march to Selma; Koinonia Farm and the germination of Habitat for Humanity; inner-city activism and counter-culture communities in …