A clique is an informal and restricted social group formed by people who share common interests. They are often subsets of larger social groups and are most commonly associated with teenagers, although they may exist anywhere. Teenage cliques have been relevantly addressed in both literature and cinema as movies such as Heathers, Clueless, Mean Girls, The Breakfast Club and Odd Girl Out show. These films explore the subject, and are based on literary works by psychologists.
Cliques also exist politically, in the form of ruling cliques or a group of politicians who limit control of others through insular conduct. Political cliques are often a feature of corruption when power is not shared equally among those who are supposedly on a level footing. A complex series of military alliances between warlords in a civil war can form cliques, as did the Zhili clique in the history of the Republic of China. Similar situations also featured in the rise of Nazi Germany, and are also common in many Middle Eastern and South American nations which are not wholly democratic. http://en.wikipedia.org/wiki/Clique