At the electronics Stack Exchange site, Electrical Engineering, we have been plagued by a particular user for a while. (I am not a moderator there and haven't reached the 10k reputation level which allows me to see deleted posts.) I and many other users have been witnesses to the postings by a troubled/troublesome user who creates numerous sock puppet accounts to continue attacking other users.
We recently had one of our highest reputation users mysteriously delete his account. This person was frequently the target of the troll. Whether the high rep user felt threatened, or was simply tired of the troll, or deleted his account for other reasons, we do not know.
The moderators are doing the best they can with the tools they have to disallow access by the troll, but inevitably there are times when the troll gains access by posting semi-lucid answers, and eventually starts to attack users again.
My question is this: Does Stack Exchange Inc. (the parent company) have legal means to determine the identity of and pursue legal action against a user who continues to create trouble, issue threats, and generally degrade the quality of a Stack Exchange site? If so, what needs to happen? Do the moderators need to simply make a formal request? Does Stack Exchange have a legal team that can investigate?
I think I speak for many users at Electrical Engineering when I say we are tired of dealing with the problems that have arisen from one individual, and earnestly request that it be given some serious attention.