The Hell's Satans were an outlaw motorcycle club formed by Homer after he won a Harley-Davidson motorcycle at Greaser's Cafe.
It consisted of Homer, Lenny, Carl, Moe and surprisingly, Ned. They caused trouble around Springfield and got into a magazine because of this.
Homer was then visited by Meathook, the leader of another motorcycle gang called the Hell's Satans as well. After this, the gang broke up.