Chester Morris ( Chester Morris )

Horatio 'Boston Blackie' Black

Maylia Fong ( Maylia Fong )

Mei Ling

Joan Woodbury ( Joan Woodbury )

Red, the Bar-Girl

Don McGuire ( Don McGuire )

Les, the Bus Guide

Richard Lane ( Richard Lane )

Inspector William R. Farraday

Sid Tomack ( Sid Tomack )

The Runt

Frank Sully ( Frank Sully )

Sergeant Matthews

Charles Arnt ( Charles Arnt )

Pop Gerard

Luis van Rooten ( Luis van Rooten )

Bill Craddock (as Louis Van Rooten)

Philip Ahn ( Philip Ahn )

Wong Chung Shee

Benson Fong ( Benson Fong )

Ah Hing

Victor Sen Yung ( Victor Sen Yung )

Peter Brocco ( Peter Brocco )

Rolfe

Harry Strang ( Harry Strang )

Mac

Pat O'Malley ( Pat O'Malley )

Officer Jim

Edgar Dearing ( Edgar Dearing )

Reiber