Leo Gorcey
— Slip Mahoney
Huntz Hall
— Horace Debussy 'Sach' Jones
G. Pat Collins
— Bat Armstrong
Effie Laird
— Ma Armstrong
Bernard Gorcey
— Louie Dumbrowsky
William Benedict
— Whitey, Bowery Boy
David Gorcey
— Bowery Boy #4, dark-haired
Buddy Gorman
— Bowery Boy #5, slender
Joseph Crehan
— Warden Burnside
Richard Benedict
— Skeets O'Neil
Frank Marlowe
— Ma's Clean-shaven Henchman
Eddie Foster
— Ma's Henchman with Mustache
Gabriel Dell
— Gabriel 'Gabe' Moreno
Lyn Thomas
— Shirley O'Brien, Gabe's Secretary
Eddie Gribbon
— 'Hobo' Barton, convict
Paul Dubov
— Pretty Boy Gleason
Joe Turkel
— Benny the Blood (as Joseph Turkel)
George Chandler
— 'Squirrely' Davis, convict
Jonathan Hale
— The Judge
Edward Gargan
— Officer Murphy
William Haade
— Dialogue Cop Arresting the Boys
Harry Strang
— Solitary Confinement Guard
Lyle Talbot
— Prison Yard Guard
Stanley Blystone
— Captain of the Guards
Tom Kennedy
— Third Convict Calling Out from Cell