"Slip and Sach take the rap for a robbery they did not commit in order to uncover the real robbers, whom they suspect are led by a convict who gives orders to his gang outside via a short-wave radio stashed somewhere in the prison."
Leo Gorcey
as Slip Mahoney
Huntz Hall
as Horace Debussy 'Sach' Jones
G. Pat Collins
as Bat Armstrong
Effie Laird
as Ma Armstrong
Bernard Gorcey
as Louie Dumbrowsky
William Benedict
as Whitey, Bowery Boy
David Gorcey
as Bowery Boy #4, dark-haired
Buddy Gorman
as Bowery Boy #5, slender
Joseph Crehan
as Warden Burnside
Richard Benedict
as Skeets O'Neil
Frank Marlowe
as Ma's Clean-shaven Henchman
Eddie Foster
as Ma's Henchman with Mustache
Gabriel Dell
as Gabriel 'Gabe' Moreno
Lyn Thomas
as Shirley O'Brien, Gabe's Secretary
Eddie Gribbon
as 'Hobo' Barton, convict
Paul Dubov
as Pretty Boy Gleason
Joe Turkel
as Benny the Blood (as Joseph Turkel)
George Chandler
as 'Squirrely' Davis, convict
Jonathan Hale
as The Judge
Edward Gargan
as Officer Murphy
William Haade
as Dialogue Cop Arresting the Boys
Harry Strang
as Solitary Confinement Guard
Lyle Talbot
as Prison Yard Guard
Stanley Blystone
as Captain of the Guards
Tom Kennedy
as Third Convict Calling Out from Cell
Jean Yarbrough
Director
Charles R. Marion
Screenplay
Tom Lambert
Sound
Raymond Boltz Jr.
Set Decoration
Dave Milton
Art Direction
William Austin
Editor
Jan Grippo
Producer
Marcel Le Picard
Director of Photography