Sapphire Films was founded by producer Hannah Weinstein with initial funds from the Hollywood branch of the Communist Party USA.[2] Weinstein hired nearly two-dozen blacklisted American writers to script The Adventures of Robin Hood (and later The Four Just Men) under pseudonyms, and instituted elaborate security measures to ensure that the writers' true identities remained secret.[2]
Sapphire Films ceased to function in late 1961 owing to financial problems caused by Weinstein's then husband, Jonthan Fisher.[3]