Oligarchy (; ) is a conceptual form of power structure in which power rests with a small number of people. These people may or may not be distinguished by one or several characteristics, such as nobility, fame, wealth, education, or corporate, religious, political, or military control. Throughout history, power structures considered to be oligarchies have often been viewed as tyrannical, relying on public obedience or oppression to exist. Aristotle pioneered the use of the term as meaning rule by the rich, for which another term commonly used today is plutocracy. One of the first oligarchies in history is that of Sparta, which developed the concept alongside its rival Athens, and essentially provided a counterpoint to Athenian democracy. In the early 20th century Robert Michels developed the theory that democracies, like all large organizations, tend to turn into oligarchies. In his "Iron law of oligarchy" he suggests that the necessary division of labor in large organizations leads to the establishment of a ruling class mostly concerned with protecting their own power. Minoritarianism The exclusive consolidation of power by a dominant religious or ethnic minority has also been described as a form of oligarchy. Examples of this system include South Africa under apartheid, Liberia under Americo-Liberians, the Sultanate of Zanzibar, and Rhodesia, where the installation of oligarchic rule by the descendants of foreign settlers was primarily regarded as a legacy of various forms of colonialism. A business group might be defined as an oligarchy if it satisfies all of the following conditions: Owners are the largest private owners in the country. It possesses sufficient political power to promote its own interests. Owners control multiple businesses, which intensively coordinate their activities. George Bernard Shaw defined in his play Major Barbara, premiered in 1905 and first published in 1907, a new type of Oligarchy namely the intellectual oligarchy that acts against the interests of the common people: "I now want to give the common man weapons against the intellectual man.