Greaser Challenge is a challenge in Chapter III.
The Mission
Setup
Hal and Lucky are watching TV and are complaining that nothing is on. Jimmy barges in, states that he's taking it over and he wants them gone immediately.
The Mission
Hal and Lucky immediately attack, and are joined by Vance. After knocking the three of them out, Norton, Lefty and Ricky run out of the back rooms and attack. Ricky will use a slingshot. After knocking them out, the mission is won, and Jimmy will earn the Greaser hideout. If Jimmy is knocked out, a short cutscene will show Norton shoving Jimmy outside the building.