The vice president of an Atlanta media nonprofit has been unmasked as a violent Antifa extremist and organizer of an armed militancy camp. River-Michael Les Sewell, 25, has repeatedly boasted about using his prior experience in the United States Armed Forces to teach his fellow far-left radicals how to inflict violence on those with opposing points of view, namely anyone who supports the city's new police training facility. Sewell "advocates for killing political opponents" and has repeatedly expressed support for domestic terrorist gunman Manuel Esteban Paez Terán, who was shot dead after shooting and injuring an officer when law enforcement...