I'd have preferred this all to have been dealt with quietly, sparing any embarrassment, but that didn't happen. I can't remain silent so here we are.*
There may be a more a viscous section of Wikipedia than I-P area but I've no idea what it is. Veterans will acknowledge that it's a bloodthirsty zone filled with endless bickering over tiny details, constant sockpuppet harassment and general nastiness (it's also a great place to explore the finer points of sophistry). The specter of a pro-Israeli emailing list has been raised numerous times but no one could offer more than circumstantial evidence. Until now.

This may come as no surprise to our jaded audience but it's a great surprise to those fresh-faced young editors who bought the party line of "There is no cabal!", namely me. My hope was that Wikipedia's enforcement mavens would take over once they were made aware of the situation. That was a few months ago. I'd received these files from an anonymous email address after running afoul of the puppet masters (here, Jan/Feb-ish). While I can't verify how they were obtained (leak/hack/etc.) I can verify their authenticity. Real names and contact info not otherwise available have been blanked so you'll have to take my word for it (or someone else's as they don't seem to be a huge secret).

We (myself, two editors not involved in the topic area, a retired CU and two other folks) researched the group and sent our findings to Arbcom, to no avail.

The files in question, the only thing remotely interesting in this post.
The members, most of whom will come as no surprise to familiar editors (this is not exhaustive, it covers most of the editors in the emails released here but not all of them in the files nor, I suspect, all of them involved):
-Nocal100: aka Isarig, long term editor turned prolific puppetmaster
-breein1007
-Mbz1
-Shuki
-Stellarkid aka Djudem/Concheet from the 2008 CAMERA group, the other great puppetmaster
-Jiujitsuguy
-brewcrewer
-Broccoli
-a peripheral glimpse of Jayjg who, despite his reputation, acts quite honorably
So that's one CAMERA fellow, one of the original CAMERA members, and one who even made his own canvassing group (a fourth member is peripherally involved in another group that made headlines for a similar tactic). Hmmm.

HOW IS YOU KNOW THEY ARE REAL?!
The email addresses match according to various editors who've had contact with them. The on-wiki activity matches (compare this file with this edit and look at these sources provided by the banned puppet master inserted by an editor never before involved on the page, continuing the argument for the sockpuppet).
Oh, and Mbz1 admitted it.

YOU ARE BREAKING TEH LAW/INVADIN MAH PRIVACIES!
No dice, champ. I was neither the initial obtainer nor revealer. Talk to my lawyer.

Why bother bringing this up if no one will do anything to stop it?
Because people deserve to know what they face before investing their time. If you edit in a contentious place be aware that these groups exist and weigh the possibility of wasted, frustrating hours versus doing something else. The group itself isn't too surprising. The interesting bit is Wikipedia's complete failure to shut it down after notification of its existence or at least get rid of the most culpable offenders. If you want to, say, create an encyclopedia you'd do well to get rid of a toxic ring of ultra-nationalist sock puppeteers. So let this be a warning to you, oh newbie editors. The trail points to group operating in the same manner since about 2009 and it's all been reported before. Mbz1 and Broccoli cooperating on DYK? Brewcrewer working with NoCal socks? All were reported and dismissed. There's plenty of other hints at collusion which I'll leave you to dredge up yourself, it's all anti-Arab/Likudnik content, DYK pumping (best way to get visibility for pet causes) and sockpuppet harassment. There's more material but I've rambled long enough for an initial post.

TL/DR: Whiny new guy realizes there are cabals, is shocked by WP's failure to take even token preventive actions.

*In order to save time and focus on the topic, I hereby plead nolo contendere to anything remotely plausible I'm accused of doing (short of anything illegal) including whatever I was banned for, renounce my right to appeal, and accept our Lord Jimbo as my savior. This should be not be mistaken as the truth, just a time saving measure.