Hosea Williams, left, who led a march in Selma, Ala., leaves the scene as state troopers break up the demonstration on what is known as Bloody Sunday on March 7, 1965. Behind him, at right, John Lewis of the Student Non-violent Coordinating Committee is put on the ground by a trooper. Lewis suffered a possible skull fracture. Supporters of black voting rights organized a march from Selma to Montgomery to protest the killing of a demonstrator by a state trooper and to improve voter registration for blacks, who are discouraged to register. (AP Photo)