Script Download:RemoveSPsiteUsers.zip
http://gallery.technet.microsoft.com/scriptcenter/How-to-remove-users-from-a-d792858b

This PowerShell script shows how to remove users from a site that have a specified permission level.

You cannot remove users from a site by using the UI and it is difficult to find all users that have a specific permission level.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery