Jim Davis
Joseph Cummins
Acting
Ian Keith
FBI Director Sinclair
Acting
George Travell
Rucca
Acting
Frederick Worlock
Hugo Stregel
Acting
Stanley Andrews
Mitchell (uncredited)
Acting
Hugh Beaumont
FBI Chemist (uncredited)
Acting
Ralph Dunn
Vic, Stregel's Thug (uncredited)
Acting
Byron Foulger
Pelly, Stregel's Henchman (uncredited)
Acting
Ian Wolfe
Gruning, Stregel's Henchman (uncredited)
Acting