Question: Gang graffiti started back in the 1960s due to the rivalry between the Bloods and gang in Los Angeles, California in what year?
Sentence (from "Gang graffiti"): Gang graffiti started back in the 1960s due to the rivalry between the Bloods and the Crips and Sureños and Norteños, and continued on until the 1992 Los Angeles riots.
Relevant evidence: Yes