Baron Zemo. Bear with me a second.
I only just got done reading Avengers Undercover (sorry I missed its solo issues) and the idea of the Masters of Evil growing from just a random team-up of bad guys to a big underground criminal city really struck a chord with me, and while that series doesn't bother to devote any time to the hows and whys of its workings, I feel like there's a great story buried in there. Picture Helmut Zemo not just as a supervillain, but as the elite of supervillains, and he's trying to make a stable black market for guns, drugs, muscle-for-hire, you name it - except that every single person he can find to help, he knows he can't trust, because they're all scumbags. Even his closest confidantes are either suspicious (Madame Masque), insane (Daimon Hellstrom) or just dumb (Constrictor). It's a dangerous game of plans within plans and double-crosses heaped on top of each other, and the only way to win is to simply be better than everyone else. Lucky he's Zemo and that kinda comes with the name.
Short version: Think the royal family drama of Inhumans except everyone's a bastard.