- Sydney Boehmscreenplay
- Malvin Waldadditional dialogue
- Frank J. Wilsonarticle "Undercover Man: He Trapped Capone"
- Jack Rubinstory outline
- David Bauer(as David Wolfe)
- Patricia Barry(as Patricia White)
Rest of cast listed alphabetically
- Richard Bartell(uncredited)
- Peter Brocco(uncredited)
- Marcella Cisney(uncredited)
- Michael Cisney(uncredited)
- Tom Coffey(uncredited)
- Tom Coleman(uncredited)
- Roy Darmour(uncredited)
- George Douglas(uncredited)
- Sidney Dubin(uncredited)
- Ben Erway(uncredited)
- Virginia Farmer(uncredited)
- John George(uncredited)
- Everett Glass(uncredited)
- Jack Gordon(uncredited)
- Sol Gorss(uncredited)
- Tom Hanlon(uncredited)
- Kenneth Harvey(uncredited)
- John Ireland(voice) (uncredited)
- Ted Jordan(uncredited)
- Paul Kruger(uncredited)
- Sam LaMarr(uncredited)
- Robert Malcolm(uncredited)
- Joe Mantell(uncredited)
- Paul Marion(uncredited)
- Irene Martin(uncredited)
- Allen Mathews(uncredited)
- Edwin Max(uncredited)
- Frank Mayo(uncredited)
- Daniel Meyers(uncredited)
- Silvio Minciotti(uncredited)
- Al Murphy(uncredited)
- Billy Nelson(uncredited)
- Brian O'Hara(uncredited)
- Franklin Parker(uncredited)
- Rose Plumer(uncredited)
- Ed Randolph(uncredited)
- Stella Razeto(uncredited)
- William Rhinehart(uncredited)
- Wally Rose(uncredited)
- Cosmo Sardo(uncredited)
- Bernard Sell(uncredited)
- Larry Steers(uncredited)
- Bert Stevens(uncredited)
- Bill Stubbs(uncredited)
- Glen Thompson(uncredited)
- William Vedder(uncredited)
- Ralph Volkie(uncredited)
- Helen Wallace(uncredited)
- Harlan Warde(uncredited)
- Than Wyenn(uncredited)
- Esther Zeitlin(uncredited)
- Robert Rossenproducer
- Burnett Guffeydirector of photography
- Jean Louisgowns
- Greta Ardinehair stylist (uncredited)
- Robert J. Schiffermakeup artist (uncredited)
- Wilbur McGaughassistant director
- Jack A. Goodrichsound engineer (as Jack Goodrich)
- Eddie Parkerstunts (uncredited)
- Andy Andersoncamera operator (uncredited)
- William Johnsongaffer (uncredited)
- Irving Lippmanstill photographer (uncredited)
- Walter Meinsgrip (uncredited)
- Morris Stoloffmusical director (as M.W. Stoloff)
- Arthur Mortonorchestrator (uncredited)
- Frances McDowellscript supervisor (uncredited)
Crew believed to be complete
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