Being blacklisted is a career suicide. You will never find a job again. No one is going to trust you with anything of importance. You messed up, son. Your life in a corporation is over. Maybe you asked the wrong questions, maybe you just did your job poorly or maybe you banged some vengeful over-protective prick’s daughter (or son, whatever floats your boat) and now you’re broke and homeless.
It’s not all doom and gloom though. You can move into a Fed ghetto. More than likely you won’t survive a week in there.