Hi ya, think I can help you out. I know of 2 but think there is a 3rd somewhere although not sure if it folded.
Firstly there is the corrosion rangers which is a spin of of the 1AT on heros which is for corruptors. I believe you might need to speak to Twisted Feather to join them. I dont know if they are team together all the time i.e. make all corruptor teams.
The other is a spin off sg that I have recently formed myself which houses some of our alts. With this sg we have made EVIL Wednesdays where every wednesday from 8 pm we play on some of our specially created alts for our themed team nights (corruptors and doms as they seem quite rare). We are making it so are very teamed orientated i.e. everyone taking leadership pool for maximum buffage etc.
As this sg (E.V.I.L. Rejects) is not a serious sg it doesnt matter if your toon is not your main one. Currently most of us are level 10 so wont be too much hassle to catch up. I guess it all depends on what/how you want to play. The corrosion rangers are a very friendly bunch whilst E.V.I.L. Rejects is a newly formed sg created to house some of our alts and to have once a week (currently) teaming sessions.
Heros
Max Powerz: Lv 50 Tanker
Villains
Max Khaos: Lv 50
Overlord of E.V.I.L.
My Brute - http://maxy-khaos.mybrute.com/
LF SG! Arc ID# 193083
I want moooooooore. We should organise another eve, Max.
The corrosion rangers would indeed be delighted to have you if you think you can handle it 
We have all corruptor night on a thursday evening, plus regular other teamage with the guys from EVIL, Bloodline, Pirates of the Apocalypse and the rest of the 1AT VGs (SIN, Force of Will, Ministry of Pain, Deus Ex Machina).
Feel free to visit our forums here! to see if you like the look of us 
Why hello Sasqu,
Yes, the 1AT does house all certain types of AT's in different SG's, which are in turn all coalitioned with each other. Also, every Thursday night, there is a all-corruptor team going, and i'm sure there is spaces still available.
For further info/to apply, just check my sig below for our official forums.
[Edit]Curse you Cap'n and your quick typedness! [/Edit]
Too slow Jummy, too slow
Cap wins again! (or summit like that, not exactly sure what I "win", but still...)
[ QUOTE ]
Too slow Jummy, too slow
Cap wins again! (or summit like that, not exactly sure what I "win", but still...)
[/ QUOTE ]
Damn Pirates, always in for the steal
If you'd be interested in the corrosion rangers there are a good few of us that can help you out.
feel free to look out for me on Global (@Pyrotorch or @Pyron00b) and i'll happily sort this out
All corrupter night runs thursday nights at 7 (Uk time) any and all welcome although as we are all running at about low teens lvl wise at the mo LK or MF's may be needed. 
I have a few corruptor alts that don't have sg's. I would love to get involved in an all corruptor sg or team.
Look for me on er any of my 3 globals for an invite to the CR tonight, I'll be on now untill late (NTL connect willing).
oo a corruptor SG sounds just up my street
was almost ready to hang up ol' Q Pid's cape after i hit level 26, couldnt seem to find anyone to team with.
will definatly look into those too
Hi all,
Old player returning here and I was wondering if there were any all rad or all corruptor VGs on Union? I used to play in one (except made up of defenders) back in the old days on the US servers and it was a lot of fun and made for a nice change of pace. After all who doesn't like dozens of stacked buffs and debuffs? It probably wouldn't be for my main character if that makes a difference to anyone. I'm assuming it wouldn't though..