What is the difference between a group leader and an organization administrator?

A group leader is granted access to a specific group(s) for an organization, and are able to manage a group by sending announcements, creating action items, adding or removing members from the group, and running reports or collecting data from group members.

An organization administrator is granted access to an entire organization, and may not only manage all groups owned by the organization, but they can also create new groups on behalf of the organization, as well as access and communicate with all contacts across all of the organization’s groups.