The Brotherhood
The Brotherhood of Light is an Assembly of many highly-evolved souls, both men and women, incarnate and discarnate, who are Masters of Life. They are our Elder Brothers and Sisters who have overcome all Earthly desires and limitations including death, thus attaining Liberation and the right to serve humanity as Members of the Spiritual Hierarchy. They are the Great Ones, Master Teachers, whose overshadowing presence has guided the founding of A.E.S. specifically for the dissemination of Their teachings.
There are many books available containing detailed information about The Great White Lodge, Spiritual Hierarchy, and the various Orders of Brotherhoods. One excellent source is the writings of Alice A. Bailey, Lucis Trust publishing. http://www.lucistrust.org/