Best way to block wp users fast?
 

I have some ppl I've hired and would no longer like give them access to a bunch of blogs. What is the best way to disable their access to the blogs?

Their emails are on the accounts now. I was thinking of changing it to my email address and just changing passwords but that is painful on 85 blogs.

Any thoughts?

white list only your IP address thru the server / hosting co. if this is a wp-admin login issue
esp. if the blogs are on the same server or host

Delete the users?