robber baron
noun/ˌrɒbə ˈbærən/
/ˌrɑːbər ˈbærən/
(North American English)- a person in business who becomes very rich, often by illegal means and without caring about other people. The term was applied especially to a number of leading US businessmen in the late 19th century, including John D Rockefeller and Cornelius Vanderbilt.
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robber baron