Several users have stated in political threads that they spend the day flagging political stories. I don't think there's any reason to believe a bot is doing it.
I have been calling them "The Guardians of New."
But maybe the far more appropriate term has been there all along:
> The Knights Who Say "Ni!"
Fair. It doesn't have to be a bot to look like one. Is certainly a hive mind behavior that is not any less heavy handed than "see a word, click flag button."