6. Weyland-Yutani (Alien)
Weyland-Yutani completely characterises the selfish, cold organisation stereotype, for their determination to get their hands on a Xenomorph (alive, no less) has cost countless lives, while the company seems more upset about the money spent on the missions, and moreover, the damage caused by the surviving humans, notably with Ellen Ripley exploding the Nostromo at the end of Alien. The infrastructure of the company means that it's a horrible place to work at regardless of the level you're at; if you're a blue-collar miner like the crew of the Nostromo, nobody gives a damn about you, yet if you're a smarmy, high-flying lawyer like Carter Burke in Aliens, you're also going to be thrown unwittingly into the deep end too. Hell, even the guys running the company - like AvP's Charles Bishop Weyland - often end up on the wrong end of the stick, proving that nobody is safe.