Cult is a term, in most contexts pejorative, for a relatively small group which is typically led by a charismatic and self-appointed leader, who excessively controls its members, requiring unwavering devotion to a set of beliefs and practices which are considered deviant (outside the norms of society).[1] This term is also used for a new religious movement or other social group which is defined by its unusual religious, spiritual, or philosophical beliefs and rituals,[2] or its common interest in a particular person, object, or goal. This sense of the term is weakly defined – having divergent definitions both in popular culture and academia – and has also been an ongoing source of contention among scholars across several fields of study.[3][4]: 348–356 An older sense of the word involves a set of religious devotional practices that is conventional within its culture, is related to a particular figure, and is frequently associated with a particular place.[5] References to the imperial cult of ancient Rome, for example, use the word in this sense. A derived sense of "excessive devotion" arose in the 19th century.[i] Beginning in the 1930s, cults became an object of sociological study within the context of the study of religious behavior.[6] Since the 1940s, the Christian countercult movement has opposed some sects and new religious movements, labeling them "cults" because of their unorthodox beliefs. Since the 1970s, the secular anti-cult movement has opposed certain groups and, as a reaction to acts of violence, frequently charged those cults with practicing mind control. Scholars and the media have disputed some of the claims and actions of anti-cult movements, leading to further public controversy. Sociological classifications of religious movements may identify a cult as a social group with socially deviant or novel beliefs and practices,[7] although this is often unclear.[8][9][10] Other researchers present a less-organized picture of cults, saying that they arise spontaneously around novel beliefs and practices.[11] Groups labelled as "cults" range in size from local groups with a few members to international organizations with millions.[12] There are thousands of cults around the world.[13]