Secret society
Definitions

The exact qualifications for labeling a group a secret society are disputed, but definitions generally rely on the degree to which the organization insists on secrecy, and might involve the retention and transmission of secret knowledge, the denial of membership or knowledge of the group, the creation of personal bonds between members of the organization, and the use of secret rites or rituals which solidify members of the group.

Anthropologically and historically, secret societies have been deeply interlinked with the concept of the Männerbund, the all-male "warrior-band" or "warrior-society" of pre-modern cultures (see H. Schurtz, Alterklassen und Männerbünde, Berlin, 1902; A. Van Gennep, The Rites of Passage, Chicago, 1960).

A purported "family tree of secret societies" has been proposed, although it may not be comprehensive.

Alan Axelrod, author of the International Encyclopedia of Secret Societies and Fraternal Orders, defines a secret society as an organization that:

Historian Richard B. Spence of the University of Idaho offered a similar three-pronged definition:

Spence also proposes a sub-category of "Elite Secret Societies" (composed of high-income or socially influential people) and notes that secret societies have a frequent if not universal tendency towards factionalism, infighting, and claiming origins older than can be reliably documented. Spence's definition includes groups traditionally thought of as secret societies (Freemasons and Rosicrucians) and other groups not so traditionally classified such as certain organized crime cabals (the Mafia), religious groups (Order of Assassins and Thelema) and political movements (Bolsheviks and Black Dragon Society).

Historian Jasper Ridley argues that Freemasonry is, "the world's most powerful secret Society".

The organization " Opus Dei " (Latin for "Work of God") is portrayed as a "secret society" of the Catholic Church. Critics such as the Jesuit Wladimir Ledóchowski sometimes refer to Opus Dei as a Catholic (or Christian or "white") form of Freemasonry. Other critics label Opus Dei as "Holy Mafia" or "Santa Mafia"
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