Wikimedia Bugzilla is closed!

Somehow related to bug 8707 "Support global (crosswiki) blocking", but technically not identical:

A crosswiki usernameblacklist would be extremely helpful as there are more and more targeted
account creations with 'very' abusive names all over the different Wikimedia projects, specifically 
using real names combined with severe personal attacks, sometimes with private data made 
public (note: potentially legal issues). Typically a user creates accounts on projects that are in a 
language the victim neither speaks nor monitors. 

Once user pages for such accounts were created, they show up at the top of search results very 
quickly (due to Wikipedia's generally high ranking). And usually - contrary to pages in other
namespaces - user pages rarely get deleted anywhere if the local admins don't understand the 
meaning of the account names – in some cases the user pages were also not created by the user 
itself, but actually by "welcoming" users or by users placing silly block notes on the pages ...
So this is more an issue of preventing creation of specific account names and of unwanted 
page indexing (through search engines) rather than one of simple log or listusers entries. 

If this abusive account and page creation is done on a bunch of projects, the search results for 
a user's real name can be completely "occupied" by these insults for weeks (or months). And the 
removal of all such user pages from the Wikimedia projects and from the search engines needs 
time. The negative effect by this kind of "vandalism" is fairly high compared to the needed effort 
to reach it therefore. And the popularity of this method of attacking real persons highly increased 
in the last months as far as I can tell, so making a crosswiki usernameblacklist possible - at least 
for Wikimedia projects - would be very helpful (I suggest it should be editable by stewards only).

Thanks in advance!