Secret society
club or organization whose activities and inner functioning are concealed from non-members
Cambridge Apostles
Red Lanterns
Defenders
Black Hand
Illuminati
Odd Fellows
United Officers' Group
ODESSA
Union of salvation
Hunters' Lodges
Confederacy
Green Gang
Order of Assassins
Skull and Bones
Cartel of the Suns
Brethren of Purity
Union of Salvation
Secret Society
Knights of the Golden Circle
La Santa
Sande society
Molly Maguires
Maffia
Northern Society
Poor Conrad
American Protective Association
A∴A∴
Yellow Sand Society
Nizari Ismaili state
Organisation Consul
Suicide Club
Union of Prosperity
Wren Society
Small Swords Society
Duk-Duk
Southern Society
Young Italy