A synchronized group is a subgroup of a synchronization point, imported from Active Directory.
In the Groups pane, a synchronized group appears as follows:
You can change policies assigned to a synchronized group.
You cannot change any synchronized group settings other than group policies. You cannot rename, move, or delete a synchronized group. You cannot move computers or groups into or from the group. You cannot create or delete subgroups in the group. You cannot change synchronization settings for the group.