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," 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.