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Definitions of robber baron:
noun: (historical) In Europe, an aristocrat who charged exorbitant fees or otherwise exacted money from people who journeyed across land or waterways which he controlled.
noun: (chiefly US, idiomatic, usually derogatory) Especially in the 19th and early 20th centuries, a business tycoon who had great wealth and influence but whose methods were morally questionable and often unethical.