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