When asked about the reasoning behind the cross lighting, Barker says its a ritual that started with the six founding members of the KKK, who would go to the highest point and light a cross so members would know where to meet.
He says it's also a symbol that Christ is the light of the world.
MORE: http://www.wbtv.com/story/18633174/spotlight-on-kkk-rally-causes-confusion-over-location
