Three teenagers were charged Monday in the beating death of a 16-year-old Chicago honor roll student on his way home from school, a melee captured on a cell phone video that shows a group striking him with boards and kicking him as he lay on a sidewalk. The death of Derrion Albert, a sophomore at Christian Fenger Academy High School, on Thursday has reignited community outrage over chronic violence involving city students and is putting pressure on school and police officials to address gang problems that often are at the root of such violence. The Chicago public school system is...