On June 3, 1943, a mob of 50 sailors from the the Los Angeles Naval Reserve Armory beat up everyone perceived to be Hispanic, starting the week-long Zoot Suit Riots. From the article:
"On May 31, a clash between uniformed servicemen and Mexican American youths resulted in the beating of a U.S. sailor. Partly in retaliation, on the evening of June 3, about 50 sailors from the local U.S. Naval Reserve Armory marched through downtown Los Angeles carrying clubs and other crude weapons, attacking anyone seen wearing a zoot suit or other racially identified clothing.
In the days that followed, the racially charged atmosphere in Los Angeles exploded in a number of full-scale riots. Mobs of U.S. servicemen took to the streets and began attacking Latinos and stripping them of their suits, leaving them bloodied and half-naked on the sidewalk. Local police officers often watched from the sidelines, then arrested the victims of the beatings."