So, in the zoosadist leaks, multiple groups are mentioned in various chats. I thought I'd detail these here.
1) RL Maws and Jaws: Kero was in this one. Fetish content for vore fans most likely.
2) The Perrita: first place Straight Not Virgin was shared. Seems Kero was in it as he's the first to contact SnakeThing about the video, then Shepnuts mentions it being in this group.
3) “rape and bondage group” that’s unnamed in chat, Kero was also in this. Apparently it wasn't too active. A tamer BBB.
4) “a private, invite only CP group” that goes unnamed, but Snakething was in it.
5) “Sadist” unknown.
6) Furry Gore & Hard Vore: Tim Win was in here, surprisingly.
7) Global Furry Zoo (GFZ): a zoo chat that Snakething was in.

ZooSadditions or ZooSad, Zoo-S. Seems SnakeThing may have been an admin, he adds enough people to it by request.
9) Tailpipe Lovers, may have also been called Tailhole Lovers: a group dedicated to animal anal rape. It was taken down.
10) “zoosuit group” SnakeThing was running, people in it were affected when Darkshadowfox leaked content.
11) Beast: unknown group.
12) HZSA, (Hard Zoo Suiter Alliance?): a group for a planned meet to torture and kill animals, while in fursuit. Run by Snakething.
12) Aspect Zeta: group run? by Snakething. It's talked about in this thread, i think.
13) Hiss: snake rape group, MoMo and Snakething were in it.
14) “gaping dog group”, unknown.
15) Gay Stallion Lovers: large group with a lot of fursuiters in it, supposedly.
16) Foaling Around: foal rape group. Snakething was an admin.
17) MUrrsuitGifsAndVids: furry smut.
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AG, Animal Gore: group that was shut down. Run by Techno Husky and was leaked online but it seems to have been lost.
19) Cloaca Contact: possibly an 8chan group
20) Horse Rippers: run by Magic Flame, mostly slaughterhouse footage.
21) The Forest: apparently Kero was involved in this one, as well as Woof
22) “active zoosad group” Tim Win was in, unsure what group it was.
23) BB, and BOB: early version of BBB. 16 people from BOB were in BBB yet only a handful of names are ever shown, suggesting most were wiped from the group.