Muggs McGinnis
Danny Breslin
Limpy
Officer Tom Brady
Mary Breslin
Clancy
Monk Martin
Skinny, red-haired kid
Scruno
PeeWee
Mrs. Brady
Cop at Prizefight with the Lieutenant
Slats Morrison
Dorgan
Henchman Dutch
Muggs' Trainer
Police Lieutenant
Johnny Ryan, Muggs' opponent (uncredited)
Head of Reform School (uncredited)
Henchman Nick (uncredited)
Milkman George (uncredited)