Removing users from a CentOS domain controller (solved)

Management has been handed down and numerous people have left including the person who configured the DC's. I need to know where to look on these domain controllers to remove the departing users. I installed Webmin on both. Neither is running Samba or LDAP Users and Groups. What else could maintain a user database? I am not at the site now, but I will be tomorrow. I can post the server modules in use then.

BIND DNS Server
DHCP Server
Postfix Mail Server
Read User Mail
SSH Server

ran "systemd-cgtop" in the cli. One of the results,
/system.slice/samba-ad-dc.service

found samba-tool. Users removed.