How to Disable the members list pages?


I'm getting a lot of spam signups, is there a way to hide or disable the members list pages.

Also is ther a way to bulk remove user accounts.
The problem is that most SEO spammers search
"Forum software by XenForo™ ©2010-2012 XenForo Ltd."
Then they set their software to auto create users accounts and place their a url link signature back to there website.