Who is Bobby from Stone Butch Blues and what is their importance?

Bobby is the leader of a gang of football players who gang-rape Jess on the football field. This is Jess's first experience of sex, and it is more like "making hate" than making love (Chapter 3, page 41). The rape is one of the factors that leads to Jess dropping out of high school; soon, most of the kids know about it, and it is certain to happen again.