Within CloudM Manage, you have the ability to deprovision accounts. If you wish to bulk deprovision accounts, you can do this on a Tag based search, for example:
If you perform a search on a tag:
Then, click on Select All.
Then, in the top right corner of the screen, select the three dots, and select "Delete Items":
From here, then you can either delete the users or run their deprovisioning process, based on which Organization Unit they are in.