Answer:
a few persons
Broadly speaking, an oligarchy is a form of government characterized by the rule of a few persons or families. More specifically, the term was used by Greek philosopher Aristotle in contrast to aristocracy, which was another term to describe rule by a privileged few.
OR
oligarchy, government by the few, especially despotic power exercised by a small and privileged group for corrupt or selfish purposes. Oligarchies in which members of the ruling group are wealthy or exercise their power through their wealth are known as plutocracies.