Founded by Idris Oakby in the early-to-mid 1900s (JKR).
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Acolytes
Advance Guard
Argentinian Council of Magic
Brotherhood of Goblins (B.O.G.)
Campaign for Greater Freedom for Wizards
Charms Club
Dark Force Defence League
Death Eaters
Department of Magical Law Enforcement (MACUSA)
Duelling Club
Dumbledore’s Army (The D.A.)
Fresh Air Refreshes Totally (F.A.R.T.)
Ghosts Council at Hogwarts
Goblin Rights groups
Gobstones Club
Hogwarts Board of Governors
Inquisitorial Squad
International Association of Quidditch
International Confederation of Wizards (I.C.W.)
International Confederation of Wizards Quidditch Committee (I.C.W.Q.C.)
International Symposium of Animagi
Investigative Team
Magical Congress of the United States of America (MACUSA)
Major Investigation Department
Medieval Assembly of European Wizards
Ministry of Magic
Ministère Des Affaires Magiques
Most Extraordinary Society of Potioneers
Mudblood Death Camps
National Gobstone Association
Opposition
Order of Merlin
Order of the Phoenix
Pocomtuc tribe
Pure-blood Extremist Groups
Quidditch Union for the Administration and Betterment of the British League and its Endeavors (Q.U.A.B.B.L.E.)
Rotfang Conspiracy
Salem Witches’ Institute
Scourers
Second Salem a.k.a. New Salem Philanthropic Organization
Second Salemers
Silver Spears
Slug Club
Snallygaster Protection League
Society for Distressed Witches
Society for the Promotion of Elfish Welfare (S.P.E.W.)
Society for the Reformation of Hags
Society for the Support of Squibs (S.S.S.)
Society for the Tolerance of Vampires (S.T.V.)
Troll Rights Movement
Wizarding Supporters of Scottish Rugby Union (W.S.S.R.U.)
Wizards’ Council
Sources