Getting a user barred from a language

[Michael Bauer]

Could we have some help from the admins, please? I will beg if 
necessary... I've just checked the activity log for this user 
(https://launchpad.net/~alexd/+karma) and it's just not letting up. 
There *must* be a way.

Is it possible to deactivate an account globally? This user is *really* 
doing more harm than good on a massive scale.

Michael