• 
  Philip Carey

  Mason
• 
  Frank Lovejoy

  Matt Cvetic
• 
  Barry Norton

  Communist at Meeting
• 
  Charles Sherlock

  Rol de o replică
• 
  Frank Marlowe

  Worker
• 
  Colin Kenny

  Communist at meeting
• 
  Konstantin Shayne

  Gerhardt Eisler
• 
  Hans Schumm

  Communist Party Member

• 
  Bert Stevens

  Communist at Meeting
• 
  Richard Webb

  Ken Crowley (FBI chief)
• 
  Paul Picerni (I)

  Joe Cvetic
• 
  Harlan Warde

  agent FBI
• 
  Roy Engel

  Jackie's Father
• 
  Hugh Sanders

  Clyde Garson
• 
  James Millican

  Jim Blandon

• 
  Charles Horvath

  Good Leader
• 
  Edward Norris

  Harmon
• 
  Dorothy Hart

  Eve Merrick
• 
  Douglas Evans

  Chief Agent
• 
  James Adamson

  Picket
• 
  Harold Miller

  Railroad Station Clerk
• 
  Harry Tenbrook

  Spectator at Senate Hearing
• 
  Roy Roberts

  Father Novac
• 
  John Crawford

  McGowan