Administer Users By Role Module

This module enables a site to be configured so that roles other than the main administrator role can be given access to administer other users. This provides a more fine grained control over user administration than the all other nothing access to manage users that is implemented by Drupal core. This module is likely more attractive for sites with large number of user/members where a large number of roles and permissions is necessary. The Drupal 7 version of this module is quite mature.