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I think they mean the Aryan Brotherhood, which was established in 1964 and is very much an active white supremacist group. They are probably one of the better-known prison gangs in the United States due to how large, well-organized, and deadly they are. I am happy that for Gingersnap that they were previously unfamiliar with the AB, but I wouldn't call it a niche thing to have heard of. They come up in almost any kind of media that deals with prisons.