Massive List of Seconds and a handful of Noms incoming:
Evil League of Evil (Dr. Horrible)
Midnight Crew (Homestuck)
World Government (OP)
CP9 (OP)
11 Supernovas (OP)
Straw Hat Pirates (OP)
Shichibukai (OP)
Greil Mercenaries (Fire Emblem: Path of Radiance)
SOS Brigade (Melancholy of Haruhi Suzumiya)
Mystery Inc. (Scooby-Doo, Mystery Inc.)
Turks (Final Fantasy VII)
The Felt (Homestuck)
Trio of Outlaws (The Princess Bride)
Silence (Doctor Who)
Decepticons (Transformers)
Maverick Hunters (Mega Man X)
No Ma'am (Married with Children)
Dumbledore's Army (Harry Potter)
Planet Express (Futurama)
Aperture Science (Portal)
Coon and Friends (South Park)
Heroes for Hire (Marvel Comics)
Rainbow Rumpus Party Town (Homestuck)
Secret Six (DC Comics)
Suicide Squad (DC Comics)
Global Dynamics (Eureka)
BPRD (Hellboy)
City Watch (Discworld)
Daily Bugle (Spider-Man)
Wolfram and Hart (Angel)
Al Bhed (Final Fantasy X)
Juppongatana (Rurouni Kenshin)
Marines (One Piece)
Witch Hunt (Umineko)
Thunderbolts (Marvel Comics)
Section 9 (Ghost in the Shell: Stand Alone Complex)
Omnicorp (The Life & Times of Tim)
NESTS (king of fighters)
Howling Voice Guild (Suikoden series)
Eiserne Jungfrau, the 7th District Repentance Agency of the Great Court of Heaven (Umineko)
Bluth Company (Arrested Development)
Assassin's Guild (Guilty Gear)
Nexus (Pro Wrestling)
Brute Squad (The Princess Bride)
Ala Alba (Mahou Sensei Negima)
Ala Rubra (Mahou Sensei Negima)
Mariage Sorciere (Umineko)
Dunan Army (Suikoden II)
Fire Bringer (Suikoden III)
Stonecutters (The Simpsons)
Royalist Army (Suikoden V)
Night's Watch (A Song of Ice & Fire)
Liberation Army (Suikoden)
Guild of Calamitous Intent (Venture Bros)
Study Group (Community)
Reapers (The World Ends With You)
Greendale School of Air Conditioning Repair (Community)
Returners (FFVI)
Order of the White Lotus (Avatar: The Last Airbender)
Future Foundation (Marvel Comics)
X-Force (Marvel Comics, Uncanny X-Force)
Crew of the Normandy (Mass Effect)
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"Oh God, maplejet's trying to be cool again. I'll call the ambulance." - Wylvane
[NO BARKLEY NO PEACE]