Within the last three days i have caught superzerg breaking many rules. He has harassed players (following them after they told him to stop, egging their homes, and trying to steal items while a trade was being made between two players at spawn). He has also been griefing, and he has just been banned (for an hour) for his 3rd grief this week. I was even told that he tried to set someone on fire while they did not have PvP on.
Im not sure if he has been banned before (but i think he has) but i think his actions definitely deserve higher punishment. Perm-ban because obviously these small bans arent stopping his rule breaking-ways.