Chester Morris

Horatio 'Boston Blackie' Black

Maylia Fong

Mei Ling

Joan Woodbury

Red, the Bar-Girl

Don McGuire

Les, the Bus Guide

Richard Lane

Inspector William R. Farraday

Sid Tomack

The Runt

Frank Sully

Sergeant Matthews

Charles Arnt

Pop Gerard

Luis van Rooten

Bill Craddock (as Louis Van Rooten)