CHARLOTTESVILLE — A man accused of plowing a car into a crowd of protesters here — killing one person and leaving 19 injured — has long sympathized with Nazi views and had stood with a group of white supremacists hours before Saturday’s bloody crash. The accused driver, James Alex Fields Jr., 20, of Ohio, had espoused extremist ideals at least since high school, according to Derek Weimer, a history teacher. Weimer said that he taught Fields during his junior and senior years at Randall K. Cooper High School in Kentucky. During a class called “America’s Modern Wars,” Weimer said that Fields...