Davien and his uncle, a former Crip, wait for his aunt to pull the car around after Davien testified at a preliminary hearing for Jimmy Santana, a former classmate and a suspected member of the Latino gang Monrovia Nuevo Varrio. When they emerged from the courthouse, even with sheriff’s deputies to guard them, Davien and his uncle worried that they might be attacked or followed by retaliating gang members. (Barbara Davidson / Los Angeles Times)