United Brothers of Friendship and Sisters of the Mysterious Ten
The United Brothers of Friendship, originally a benevolent order established in 1861 in Louisville, KY, had both freemen and slave members. The organization later became a secret society with more than 60,000 members in various U.S. states, Liberia, Canada, and the West Indies. This membership included females referred to as the Sisters of the Mysterious Ten. For more see History of the United Brothers of Friendship and Sisters of the Mysterious Ten, by W. H. Gibson, Sr. (1897).