oligarchy -
a political system governed by a few people; "one of his cardinal convictions was that Britain was not run as a democracy but as an oligarchy"; "the big cities were notoriously in the hands of the oligarchy of local businessmen"
oligarchy -
Those who make up an oligarchic government.
oligarchy -
A state ruled by such a government.
Wikipedia
An oligarchy (from Greek ὀλιγαρχία, oligarkhía) is a form of power structure in which power effectively rests with a small segment of society distinguished by royalty, wealth, family ties, or military control. The word oligarchy is from the Greek words "ὀλίγος" (olígos), "a few" and the verb "ἄρχω" (archo), "to rule, to govern, to command". Such states are often controlled by a few prominent families who pass their influence from one generation to the next.
OmegaWiki Dictionary
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oligarchy Government by only a few, often the wealthy.