The recent flood here has all the hallmarks of a group of very nasty
Internet trolls that call themselves "Tykesground".

They work out of a Yahoo Group named, not surprisingly, Tykesground
and have ruined many other usenet groups over the past five years or
so.

http://groups.yahoo.com/group/Tykesground

The best advice I can give is not to antagonise them as they have been
known to repeatedly email bomb anyone who criticises them.

Joe.