To Delete Contacts in Bulk from Groups:
1) Add Contacts to a Group that you would like us to Delete
2) From the Group Summary Tab > Delete All Contacts in Group Button
3) Confirm "Delete All Contacts from Group" or "Cancel"
ACCESS: Users must be set to "Administrators" to Bulk Delete Contacts.
WARNING: To Recover Contacts Accidentally Deleted in Bulk Requires Paid Data Services
Groups: Add Contacts to a Group