robber barons

Noun

robber baron (plural robber barons)

1. (historical) In Europe, an aristocrat who charged exorbitant fees or otherwise exacted money from people who journeyed across land or waterways which he controlled.
   • Men who made it a custom to travel the trail to Dawson, likened him to a robber baron, perched in his fortress and exacting toll from the caravans that used his ill-kept roads.1901, Jack London, “The Man with the Gash”, in The God of His Fathers, New York: McClure, Phillips & Co., page 114

   Synonyms:

   feudal lord

2. (US, derogatory, idiomatic, usually) 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.
   • Still sails the Robber Baron’s yacht in sunny Southern seas. Daily she jams her nose ashore, and daily takes on and puts off a fresh cargo of telegraph dispatches; and he who is idling for his liver's sake knows every night the tale of Wall-street's ticker and baiteth still without cessation his...1886 March 14, “A Robber Baron Muses”, in The New York Times, →ISSN, page 3

   Synonyms:

   captain of industry, magnate