Corporate Bastard
This is a very popular career among evil doers today. The supreme might of the meganational corporation has never been stronger, so why not be the bastard at the top? There are two general ways to achieve this:

1) Start your own business. Crush your rivals. Rule with an iron fist
2) Get hired at a corporation. Claw your way to the top. Destroy all in your path

A great man once said: Family, religion, friendship. These are the three demons you must slay if you wish to suceed in business. It also doesn't hurt if you slay your rivals too, but that's just an option. There are other things you will have to remember as well.

Getting to the top - Nowadays an M.B.A. isn't enough. You have to be willing to go the extra mile, to blow up your rivals condo, to backstab your friends and blackmail your enemies. Those who get in your way are just rungs on the ladder to be stepped on. Or murdered, depending on your preference.

Corporate Takeovers - These are a must. Not only do they increase the sheer power of your company, they wreak untold havok on small business everywhere. There are numerous evil tools to assist you in this, including convert surveillaince, your team of lawyers, and pacts with the dark gods.

Brotherhoods of Evil - Where would all the great corporate bastards of today without a good ol' boy network to bind them together? You simple join a secret society while in college, and then masonic handshake your way to the top. Suggested brotherhoods of evil include: The Freemasons, The Skull and Bones Society, and Evil Fraternities (all of them)