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