Martha Irvine

Alexis Willis, center, and other high school students from Chicago's North Lawndale neighborhood hold an anti-violence sign during a march in their neighborhood on Wednesday, March 14, 2018. Willis' 16-year-old cousin was shot and killed in Chicago three weeks after this demonstration. (AP Photo/Martha Irvine)

A funeral flag waves on a hearse outside a church on Chicago's West Side on Friday, April 13, 2018, during the service for 16-year-old Jaheim Wilson, who was shot and killed a few days earlier. Wilson was a cousin of Alexis Willis, who is a Peace Warrior at North Lawndale College Prep High School. (AP Photo/Martha Irvine)

Crosses representing victims of gun violence stand outside Collins Academy High School in Chicago's North Lawndale neighborhood on Thursday, April 19, 2018. The school is one of two campuses of North Lawndale College Prep High School. Both have Peace Warrior groups, which espouse the Rev. Dr. Martin Luther King Jr.'s "Six Principles of Nonviolence" in an attempt to promote peace and interrupt conflict at their schools and in their city. North Lawndale is among the Chicago neighborhoods most impacted by gun violence. Most students know someone who's been killed. (AP Photo/Martha Irvine)

Graduating senior D'Angelo McDade leads a march in Chicago's North Lawndale neighborhood on Wednesday, March 14, 2018. About 200 students joined the march as a sign of solidarity with Marjory Stoneman Douglas High School where 17 students and educators were fatally shot. McDade and other Peace Warriors from his school wore tape over their mouths, some while carrying crosses commemorating victims of gun violence in their own city and elsewhere. (AP Photo/Martha Irvine)

Robert Cooks, a high school freshman, puts on a tie before entering his "Emerging Leaders" class at Chicago's North Lawndale College Prep High School on Friday, April 27, 2018. He said he has considered joining the Peace Warriors, a group that advocates non-violence at his school. "I thought about it, but then I didn't. ... I get in a lot of trouble." Leaders of the group say they've had trouble recruiting many boys into the group in recent years and have encouraged Cooks to join. (AP Photo/Martha Irvine)