Chester Morris as Horatio 'Boston Blackie' Black

Erik Rolf as Dooley Watson

Jeanne Bates as Mary Watson

Richard Lane as Insp. John Farraday

George E. Stone as The Runt

Lloyd Corrigan as Arthur Manleder

Douglas Fowley as Nails Blanton (Uncredited)

Sid Melton as Benny Hines (Uncredited)

Ray Teal as Policeman Joe (Uncredited)

Maude Eburne as Edna Counihan (Uncredited)

Arthur Hunnicutt as Elwood "Tex" Stewart (Uncredited)

Cy Kendall as Jumbo Madigan (Uncredited)

Larry Olsen as Johnny Watson (Uncredited)

Pierre Watkin as State Governor Rutledge (Uncredited)

Walter Sande as Detective Sergeant Matthews (Uncredited)

Jack Carr as Carpet Man (Uncredited)

Richard Alexander as Carpet Man (Uncredited)

George Anderson as Warden J.A. Edwards (Uncredited)

Jessie Arnold as Woman in Hallway (Uncredited)

Trevor Bardette as Manny Vogel (Uncredited)

Eddie Bruce as Sandy (Uncredited)

Sally Cairns as Richie Adair (Uncredited)

Eddy Chandler as Policeman Frank (Uncredited)

James Conaty as Parole Board Member (Uncredited)

Heinie Conklin as Police Desk Sergeant (Uncredited)

Marie De Becker as Miss Bailey (Uncredited)

Sayre Dearing as Reporter at Parole Board Hearing (Uncredited)

Minta Durfee as Woman in Hallway (Uncredited)

Ben Erway as Prison Warden Root (Uncredited)

Jerry Frank as George Phillips (Uncredited)

Joel Friedkin as Joe Painter (Uncredited)

Kit Guard as Wilfred Thompson (Uncredited)

John Harmon as Red Taggart (Uncredited)

Carl M. Leviness as Parole Board Member (Uncredited)

George Magrill as Policeman (Uncredited)

Al Murphy as William Jones (Uncredited)

Forbes Murray as Chairman of Parole Board (Uncredited)

Frank O'Connor as Policeman (Uncredited)

Brian O'Hara as Parker Gray (Uncredited)

Dick Rush as Policeman Lally (Uncredited)

Harry Semels as Jerome Wagner (Uncredited)

John Tyrrell as Driver (Uncredited)

Bobby Hale as British Newsman (uncredited)