Can you make a quick search for league names that are legit Rioters?
There was a post about a Riot employee trolling a match on the front page, but many people dismissed that as a 3rd party altering league names to names that were already taken...for a price.
I believe I just ran into such a person and their attitude wasn't the worst, but they were egging on someone who was already venting in all chat and wasn't defusing the situation at all.
If Riot can do a quick scan on the names in their database for Riot names that are not legitimate, I think it would save a lot of grief from people thinking Riot employees are harassing them when it's just a random person who isn't employed by Riot.
I know naming and shaming is frowned upon, so unless a Rioter asks for the name, I'll withhold it from this post.