Lets start it off then shall we 
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The ultimate in combinations, the power of the mind and power of.. well.. raw power.
Discord is a newborn Supergroup for Masterminds and Corrupters. We already have several superb members level 10+ and are looking for any who beleive themselves worthy. Formed after a mission that included slaughter of several hundred Longbow operatives, it is clear all those in Discord won't tolerate such weaklings.
Already gaining a foothold within the Rogue Islands our objective is simple.. complete control. Send a tell here or in game to myself (Necrosend), Professor Hades or Dreadeye.
Super Villains Inc.
3 Room base, 60 odd members, and most of the top lvls on the server
We have a comfy leather sofa and widescreen plasma tv.
Rogue Isle Allstars
Tired of your everyday job? Bored of going home to a house full of screaming brats and an ungrateful wife? Believe me, we know how you feel. Which is why we turned to... VILLANY!
Villany is an amazing way for relieving unwanted stress and a great channel for your emotions. Everyday we train new henchmen, and train them on their path to be the best super-powered villain they can be
The only thing we ask of you, is at least one dreadful deed under your belt, and a willingness to slap your own mother.
Current invite priviledges rest with Sonic Deluge, Evil David Pyrons, Force Recon and Black Pussycat so PM in game or send me a forum message.
So, sign up below and let the path to true villainy begin...
Rogue Isle Allstars... Lie. Cheat. Steal!
Well, this calls for introduction of the new standards in higher evil education:
E.V.I.L. University
Amongst the greatest villains who have ever lived, there have been a good deal of Doctors, Docs and Dr:s. Where do these people go to get their degrees? Where do they get their qualifications to call themselves Doctors? The answer is E.V.I.L. University.
The EVIL-U is your perfect opportunity to become a respected member of the supervillain community with low payments of Prestige and Salvage every now and then. (For more Prestige, we might not even publish those photos of you taken at that party back then...)
In realistic terms: We're a small (because we don't do random invites) Villain Group of people who know how to speak English (and not just "omgwtfpwns" or other dialects of teh interwebs) and who like to enjoy the game as much as possible (meaning we are actually not that much in a hurry to get levels, more to get a taste of the content in the game). We promise to try and organize as much events as possible, thus becoming a well-known force of evil.
For EVIL-U, it's the quality, not the quantity, that counts.
Contact persons: Lady Argenta, Toy, Forked Tongue, CT-909, Thrym.
At the moment we share (and will probably share until eternity) our webspace with our do-gooder counterpart at This Web-address
[b][color=blue]Coldest War /[color=red]/ Omega Patient[/b]
[url="http://www.the-cow.net/"][color=red]The CoW Network (Blog) /[/url][url="http://www.collegeofwar.com/"][color=blue]/ College of War[/url]
Name : Puppet Masters
Motto : 'We are the dreamers of dreams'
Description: A group of mature, casual players who simply like to chat while they play. If you prefer to solo or play in small teams, but still want the company and the knowledge there's help when you need it, then we may well be the group for you.
So far we only have a few members but hope to grow a solid group of like minded players. As with the above post, we're about getting the right people, not the numbers of people.
Contact character name : 'Nightmare Caller' but you can PM me on here too.
The Horde is comin beware paragon your time is up.
A.N.G.U.I.S.H. at our service. OURS yeah.
See our thread or anguish.forumup.com
Monsters of Love
Small group of friendly villains playing semi-casual. Currently invite only.
Leader: Hate Machine
European Villains Immorality League is now recruiting
We are hoping to be a friendly, mature, roleplaying supervillains group. The background theme for the group will be a European central clearing house for contracts, jobs and aquisitions which is making it first careful advances into the dangerous world of US Supers (and Paragon City / the Rogue isles and all that goes with it).
The preference would be that character work having used the agency in its European guise at so point in its past into their backgrounds somewhere.
We will be a casual group, meaning that people will not be required to do anything they dont want. The primary aim is to have fun, and we have no right to spoil yours by structuring it the way we want. We will however insist that members respect others roleplay and dont cut across roleplaying encounters with OOC chat.
If you are interested contact Whirlmeister or Demon Djinn in game, or PM me here.
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European Villains Immorality League is now recruiting
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EVIL Website is now up, just click here.
Super Villains Inc. Website has just gone live.
Please all check out http://www.super-villains.com/
Asylum Seekers always has the doors open for new inmates.
Prerequisites : RP : Must hate humanity.
Is there anyone on CoV who likes humanity? 
Sex Demons
Evil alternative to the Sex Kittens. Females (or close enough) only.
Homepage
I'd love to join...are we allowed two alts in it? I have a mastermind and a corruptor...mind you, low levels.
The Scourge: a roleplaying Villain group which consists of mature casual gamers, whose primary goal is to enjoy their characters and the game. Ingame goals are indeed the domination over the crime underworld, as well as proving that Arachnos is not the only true power on the islands.
Kyton is the group leader and the person to address if you would like to join in.
Agency X
Rogue and shadow ops wing of Agency, select group of the elite.
Bringers of the Apocalypse
The end of the world is coming and it's down to us to be at the forefront. You want to join, contact Cryptkicker since he's the only member at the moment! The idea is for the s.g to easily accesible to everyone on Union, roleplay elements, pvp elements and just hanging out elements are all the sg needs. Casual player or dedicated player I don't care, it's all about fun so lets have fun together!
THE RED MENACE
A new, fun-minded, social SG on Union. No grand plans - just keep it flexible and have a laugh. Some PVP and raiding, when peeps are at a suitable level; some light team RP; lots of chat and helping. No need to be a powergamer (I'm hardly hardcore myself!), but grown-up social skills preferred. 
If you're interested, PM me on the boards, or send Hedache an in-game tell if you see me around.
The League of Scoundrels
From the outside League Associated Industries looks like a normal company...
...where on the inside, it is actually a collection of villains and multiforms hell bent on global domination, none shall stop us and death to those who try...
...So if you are interested in becoming a part of LAI's extended family look up one of our board of directors, Romanov, Wynter, Mr. Torch, Silk Noir or Swiftsilence and help us create a new world order
White Magik lvl50 Defender
Commander of the Shades of Darkness
Swift lvl50 Stalker
Board director of the League of Scoundrels
Our Forum
Killing For Pleasure
Just a small mature SG a.t.m. looking for more mature players from the Netherlands.
Oftewel: Zijn er nog meer Nederlanders hier die een NL/Belgie Super Group zoeken met een wat los karakter?
(Was for the Dutch people only, sorry!)
We zoeken nog wat officers/basebuilders! En iemand die een site/forum wil maken/opzetten/bijhouden.
Greets,
The Undead Pirate Queen
Servants Of Hell
Only those created of the dark searing flames in Hell are allowed to enter this Demonic Cult...
Fallen Legends
Being the Nemesis of those dastardly do-gooders who have assembled in a supergroup called Legend, we are there to destroy everything they have built up.
In other words, the evil version of the CoH SG Legend. A fun bunch always open for new members. However we are an invite-only SG that will only toss invites if we know you aint a total moron We're a group of loons always out to have a laugh, and not really the massive powergamer. If you actually wanna join the bunch, be sure to give a shout to either Dr Robotico or Killer Blow
"god, how many devs did hami have to sleep with to get ED?"
Total Cat @Stagefright
Post em for all to see! Union only (obviously)