Dashiell Hammett, once a Pinkerton agent stationed in Butte, Montana -- where he (allegedly) turned down an offer to assassinate Little -- used some historical background on union troubles and corporate corruption in his novel Red Harvest.
Yojimbo is itself believed to have been based on Dashiell Hammett's 1929 novel Red Harvest.
He portrayed one of his characters (Vörös Margó or in English: Red Margot) on Hammett's Dinah Brand from Red Harvest.
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