The Outsiders by S. E. Hinton.
Ponyboy can count on his brothers and his friends, but not on much else besides trouble with the Socs, a vicious gang of rich kids who get away with everything, including beating up greasers like Ponyboy. At least he knows what to expect—until the night someone takes things too far. Written forty-five years ago, S. E. Hinton's classic story of a boy who finds himself on the outskirts of regular society remains as powerful today as it was the day it was written. Read a sample.