The whole black listing / smearing thing is mostly just talk. Given that they are that smarmy, others will know that about them as well. Having the 'award' will certainly put the question of who has the sour grapes out there. And hey it has given you some manager types you don't want to work for again. It is always an option of the company to walk you out the door once you decide to move on, that is more common when the company is worried about how your leaving will impact others, but I know of at least one company where it is standard policy.
The only risk of talking to a lawyer here is that they will get all excited and try to get you to take some action. Generally you have to ask, what is it you want? To complain? put a comment up on Glassdoor and move on. A lot cheaper than paying an attorney.