The notorious 1942 "Sleepy Lagoon" murder trial in Los Angeles concluded with the conviction of seventeen young Mexican American men for the alleged gang slaying of fellow youth Jose Diaz. Just five months later, the so-called Zoot Suit Riot erupted, as white soldiers in the city attacked minority youths and burned their distinctive zoot suits. Eduardo Obregon Pagan here provides the first comprehensive social history of both the trial and the riot and argues that they resulted from a volatile mix of racial and social tensions that had long been simmering.

In reconstructing the lives...