The Socs (social climbers, socialites) are the west side rich kids. For fun they like to jump Greasers and throw beer blasts. They are rich and stuck up.
The Greasers are the east side, middle- and lower-class poor kids. They wore leather jackets and jeans. They slicked their hair back to make it greasy and darker. They smoked Kools and usually tried to stay out of fights.