Allow admin to ban user from website. Admin can ban/unban user from his timeline. A ban user can't able to login or use the website. On his profile there will be user ban message.
As Holly said, We can deactivate a user, which is basically like banning (they cannot log in) from front end. Or If would like we can create a new user group, and uncheck do not allow he do anything. So are you sure we need to Ban user from front end?
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votesBanUser