We don't have synonyms for confrerie yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are confrere, conferee and confreres.
"unfortunately, when it comes to the informant who turns state's evidence against a confrere, the OED slaps on the obscure origin label., Michael Sheehan, Wordmall, February 18, 2008."
"unfortunately, when it comes to the informant who turns state's evidence against a confrere, the OED slaps on the obscure origin label., Michael Sheehan, Wordmall, February 18, 2008."