What if? --Area 51...

The thing is, the only thing stopping them killing every single person would be that if people found out what had happened, it would spread, and there would be a revolution. But they have the tech to do it; claymores are all over the area, guards armed to the teeth, air patrols... and after you get past the fence its still a mile or two to get in to the base.

But if you were going to try this, then you shouldn't advertise publically. Spread by word of mouth. If you were going to plan over the internet, use proxies and private networks. No doubt the government is watching ATS.