It is entitled 'Degenerate Players in the Work' They dont mention groups by name, but if former members read the descriptions, they will very likely recognize thier groups!
William Patterson, a scholar of Gurdjieff work has written a book describing the genesis of 3 counterfeits, and has a chapter on Burton.
Burton's teacher, Alex Francis Horn and Sharon Gans created a Fourth Way franchise called Theatre of All Possibilities.
Eventually Gans took control, and her group is called the Sharon Gans group. Rick Ross has a ton of info about her in his archives.
Robert Burton was kicked out of Horn's group because Burton was homosexual and Horn was homophobic.
Even though 'legitimate' Gurdjieff study groups exist and have produced some lovely people, it is my personal opinion that Gurdjieff was the source of the trouble. He put his followers in an impossible position because he demanded that they verifiy everything for themselves and at the same time, fostered an environment where they had to put all their trust in him. He pandered to regressive fantasies of finding a Magic Daddy and was unable to bring his students out of that fantasy. His personality was powerful and he offered some profound teachings, but I think that G was himself so needy that his personality was a distraction from the goals he claimed to serve.