The Classical Greek philosopher Plato discusses five types of regimes. They are Aristocracy, Timocracy, Oligarchy, Democracy and Tyranny.
An oligarchy (Greek Ὀλιγαρχία, Oligarkhía) (oligocracy) is a form of government in which power effectively rests with a small elite segment of society distinguished by royalty, wealth, family ties, military might, or religious hegemony.
The word oligarchy is from the Greek words for "few/one" (ὀλίγος olígos) and "rule" (ἀρχή arkhē). Such states are often controlled by politically powerful families whose children are heavily conditioned and mentored to be heirs of the power of the oligarchy.
Oligarchies have been tyrannical throughout history, being completely reliant on public servitude to exist. Although Aristotle pioneered the use of the term as a synonym for rule by the rich, for which the exact term is plutocracy, oligarchy is not always a rule by wealth, as oligarchs can simply be a privileged group.
The Bilderberg Group, Bilderberg conference, or Bilderberg Club is an annual, unofficial, invitation-only conference of around 130 guests, most of whom are persons of influence in the fields of politics, banking, business, the military, and media. Each conference is held under intense security and secrecy.