One evening my roommate from Officers Training School was stopped at a stoplight near the Alamo in San Antonio. Out of nowhere an hombre reached through the window and cut him with a straight razor from his ear to his chin. Finished OTS with a face full of stitches. That was in 1963.
Things got a little better when the city did some ethnic cleansing of the area south of there to make space for the World's Fair. LBJ cut loose federal Urban Renewal funds to lighten the complexion of the area.