Brotherhood of Mediums

The Brotherhood of Mediums was a supposed union of professional mediums, formed for "mutual protection and the exchange of methods and information,"[I] which included the distribution of biographical details about regular clients for use in fraudulent séances and other psychic readings, a system sometimes referred to as the Medium's Blue Book. It is uncertain that such a group existed in as any kind of truly organised, secret fraternity, and more likely served as a convenient label that could be affixed to any number of informal arrangements between workers in the psychic market.