Cult-like environment. If they do not like you, they will take every measure to start a paper trail on you, from day 1. You are constantly being scrutinized via cameras and coworkers. They will literally take something small and turn it into a security breach. The outfit I worked for was aversive racist. They want you to think, walk, and talk like them. Cult. If you do not, they will make your working environment beyond discomfort.
If you share these qualities, work for them. If not, run for your life. Get out!