one of the people in an oligarchy(= a government or society controlled by a small group of very powerful people)
The government of the Corinthian State was an oligarchy, and the oligarchs had control over the State.
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A few powerful oligarchs were able to seize huge industrial assets at knockdown prices.
After the fall of the Soviet Union, several national and regional networks arose that were owned by oligarchs.
The fear was that the general population of nations might become too intelligent to put up with being treated as virtual cattle under the reign of oligarchs.