In Warhammer 40k, the Warrior Lodges were secret groups amongst the Space Marines Legions during the Great Crusade. They presented themselves as a transversal organization, where official hierarchy were abolished and where Marines from all ranks and Legions could speak freely and fraternize. The lodges originated from the Word Bearers and quickly spread amongst the Legions. The dark face of the lodges were that they were actually organizing a parallel organization, to prepare the Marines to the idea of Horus' betrayal and monitor which Marines would follow the Warmaster and which ones would remain loyal to the Emperor.
I think there were lodges in most of the Legions. What happened to the lodges that were part of a Loyalist Legions? I don't remember any mention of this in the Horus Heresy books (I read a fair part of them, but not all).
Did the Loyalists (save their lodge members) ignore the involvement of the lodges in the Heresy and the lodges could stay undercover, undermining the Loyalist Legions from inside?
Or were they purged at the beginning of the Heresy?