Fraternity in the context of "Dervish"

An affinity group is a group formed around a shared interest or common goal, to which individuals formally or informally belong. Affinity groups are generally precluded from being under the aegis of any governmental agency, and their purposes must be primarily non-commercial. Examples of affinity groups include private social clubs, fraternities, writing or reading circles, hobby clubs, and groups engaged in political activism.

Some affinity groups are organized in a non-hierarchical manner, often using consensus decision making, and are frequently made up of trusted friends. They provide a method of organization that is flexible and decentralized. Other affinity groups may have a hierarchy to provide management of the group's long-term interests, or if the group is large enough to require the delegation of responsibilities to other members or staff.

A social club or social organization may be a group of people or the place where they meet, generally formed around a common interest, occupation or activity with in an organizational association known as a club. Examples include book discussion clubs, chess clubs, country clubs, final clubs, strip clubs, fishing clubs, gaming clubs, women's clubs, gentlemen's clubs (known as private member’s clubs in the U.S.), hunting clubs, military officers' clubs, political clubs, religious clubs (such as Christian fellowships), traditional fraternal organizations, service clubs, fraternities and sororities (Greek-letter organizations), business networking clubs, science clubs, hobbyist clubs, informal professional associations, and university clubs. The term can also refer to a criminal headquarters, such as the Ravenite Social Club or the Cage.

This article covers only three distinct types of social clubs – the historic gentlemen's clubs, the modern activities clubs and an introduction to fraternities and sororities. This article does not cover a variety of other types of clubs having some social characteristics. Social clubs have commonly been used by the Mafia as meeting places, many mob crews even being named after the club that they are based out of (The Palma Boys Crew, The Gemini Crew, The Veterans & Friends Crew).

The Brotherhood of the Holy Sepulchre, or Holy Community of the All-Holy Sepulchre, is an Eastern Orthodox monastic fraternity guarding the Church of the Holy Sepulchre and other Christian holy places in the Holy Land. It was founded in its present form during the British Mandate in Palestine (1920-1948). Headed by the Greek Orthodox Patriarch of Jerusalem, the brotherhood also administers the Greek Orthodox Church of Jerusalem, such as metropolitans, archbishops, bishops, archimandrites, hieromonks, hierodeacons, and monks.

The brotherhood's symbol is the taphos, a monogram of the Greek letters tau (Τ) and phi (Φ), for the word taphos (τάφος, meaning "sepulchre, grave"). It can be seen on most Greek Orthodox buildings in Jerusalem.

The Loyal Orange Institution, commonly known as the Orange Order, is an international Protestant fraternal order based in Northern Ireland and primarily associated with Ulster Protestants. It also has lodges in England, Scotland, Wales and the Republic of Ireland, as well as in parts of the Commonwealth of Nations and the United States. Queen Elizabeth II disapproved of Orange marches, calling it "silly marching business".

The Orange Order was founded by Ulster Protestants in County Armagh in 1795, during a period of Protestant–Catholic sectarian conflict, as a fraternity sworn to maintain the Protestant Ascendancy in Ireland. The all-island Grand Orange Lodge of Ireland was established in 1798. Its name is a tribute to the Dutch-born Protestant king William of Orange, who defeated the Catholic English king James II in the Williamite–Jacobite War (1689–1691). The Order is best known for its yearly marches, the biggest of which are held on or around 12 July (The Twelfth), a public holiday in Northern Ireland.

Odd Fellows (or Oddfellows when referencing the Grand United Order of Oddfellows or some British-based fraternities; also Odd Fellowship or Oddfellowship) is an international fraternity consisting of lodges first documented in 1730 in London. The first known lodge was called Loyal Aristarcus Lodge No. 9, suggesting there were earlier ones in the 18th century. Notwithstanding, convivial meetings were held "in much revelry and, often as not, the calling of the Watch to restore order." Names of several British pubs today suggest past Odd Fellows affiliations. In the mid-18th century, following the Jacobite risings, the fraternity split into the rivaling Order of Patriotic Oddfellows in southern England, favouring William III of England, and the Ancient Order of Oddfellows in northern England and Scotland, favouring the House of Stuart.

Odd Fellows from that time include John Wilkes (1725–1797) and Sir George Savile, 8th Baronet of Thornton (1726–1784), advocating civil liberties and reliefs, including Catholic emancipation. Political repressions, such as the Unlawful Oaths Act (1797) and the Unlawful Societies Act (1799), resulted in neutral amalgamation of the Grand United Order of Oddfellows in 1798. Since then, the fraternity has remained religiously and politically independent. George IV of the United Kingdom, admitted in 1780 while he was Prince of Wales, was the first documented of many Odd Fellows to also attend freemasonry, although the societies remain mutually independent.

In North America, fraternities and sororities (Latin: fraternitas and sororitas, 'brotherhood' and 'sisterhood') are social clubs at colleges and universities. They are sometimes collectively referred to as Greek life or Greek-letter organizations, as well as collegiate fraternities or collegiate sororities to differentiate them from general, non-university-based fraternal organizations and fraternal orders, friendly societies, or benefit societies.

Generally, membership in a fraternity or sorority is obtained as an undergraduate student but continues thereafter for life by gaining alumni status. Some accept graduate students as well; some also provide honorary membership in certain circumstances. Individual fraternities and sororities vary in organization and purpose, but most – especially the dominant form known as social fraternities and sororities – share five common elements: