Voters in Jackson, Miss., a mid-sized city in the heart of the Deep South, have picked a Democrat as their mayor. What’s different about this individual is that he is a former leader of the Republic of New Afrika, a group dedicated to creating an independent black nation out of five southern states. Now leading the city of about 175,000 is Chokwe Lumumba – who has a long history of radical activism and whose plans for the largest city in Mississippi could be called “revolutionary.” A co-founder of the Malcolm X Grassroots Movement, which promotes black “self-determination,” Lumumba was sworn...