channeleaton

For large multisite installations of WordPress, it’s easy to let user management go by the wayside. Many times we forget to disable or remove old user accounts, leaving our sites open to users who are no longer part of our organization.
Mass-Disable Users (MDU) aims to fix that.
MDU allows super-administrators to disable old users while retaining all of the author information. This is especially important for news sites.
How does it work?
MDU takes a list of email addresses (in CSV format) and compares it to the existing WordPress users database then any users who do not exist in the CSV file are demoted to Subscriber in every blog!
NOTE: This plugin only works on multisite!

Mass-Disable Users plugin for WordPress

Allows network admins to disable users via CSV while retaining all author information.

shawfactor

Are you running a WordPress network? You no longer need to manually add new users to each of your sites.
With this plugin, users are assigned a default role on a new site when they log in for the first time (they authenticate against the network username and password). You set the default role for each site and this plugin applies it. If the user already has a higher role assigned they keep their role on logon
You can assign different roles for each site or keep a site private by assigning no role.

LH Assign Role On Logon

Automatically add users to each site in your WordPress network on initial login.

Mass-Disable Users plugin for WordPress vs LH Assign Role On Logon