With regards to Group Membership (ADSAccountInADSGroup), this is defined, by default, in the mapping of group objects. Double-click the vrtMembersSIDArr property to view the configuration. By default, the "Try to mark the object for deletion (outstanding)" option is checked:
If the group member is removed in the target system, but not in 1IM, then the next time a sync runs, the object will be marked as "Outstanding".
With regards to ADSAccounts, it depends on how the synchronization has been configured. The default setting is defined in the workflow for synchronized objects, e.g.:
If users are deleted in the target system, they will be marked as "Outstanding" the next time a synchronization runs.