Since the beginning of time (or as long as I remember anyway) linux systems have had a "sys" and an "adm" group. What is the canonical use for them? Would it be appropriate to use either for a "super user" group? (Group permissions on directories, in sudoers, etc).
There is no standard requiring any interoperability meaning of this groups.
You can list the groups by this:
Uses of adm and sys groups:
Hope this link will help..