The real 'Cannibal Club' was a Victorian Secret Society who organized meetings where religious, racist and onorthodox views could be freely shared, but many people thought it was nothing more than just a club for gay orgies…
The Cannibal Club was a Victorian dining club associated with the Anthropological Society, likely founded at the same time in 1863 by Sir Richard Francis Burton and Dr James Hunt.
The Cannibal Cathechism – written by Swinburne for the club – as well as the club's membership, suggest that the dinners served as an opportunity for renowned radicals and social misfits to air their views: "The Cannibal Club was much more than a meeting place for homosocial merriment; it was in fact a venue for venting what were considered at the time subversive opinions about religion, race, sex, and much more."
https://en.wikipedia.org/wiki/The_Cannibal_Club
https://www.smithsonianmag.com/history/cannibal-club-racism-and-rabble-rousing-victorian-england-180952088/
In 2018 a horror/comedy under the same title came out.
https://villainmedia.com/5-reasons-we-love-cannibal-club/