This past weekend we banned a user who was a troll. It turned out that this particular user had previously been banned about a year and a half ago under a similar user name. Quite honestly, the MC had forgotten about this previously banned user, and so we only knew about this when it was brought to our attention by other users who had remembered the previously banned user name and made the connection. We have also seen cases where people who were banned (primarily trolls) make new user names after being banned and return. We usually catch these quickly and deal with it, but some hide it better than others. If you read a post and think "This is [someone already banned]," please report it. We don't remember everyone who gets banned and normally user names aren't quite so similar.