For Groups Management:

• BP Group Hierarchy: ” group creators to place a new group under an existing group. There is currently no limit to the depth of the group hierarchy.”
• BuddyPress Group Email Subscription:” allows people to receive email notifications of group activity, especially forum posts. Weekly or daily digests available. Each user can choose how they want to subscribe to their groups. “
• BP Group Management:  ”..site admins can manage BP group membership by banning, unbanning, promoting and demoting current members of any group, adding members to any group, and deleting groups.”
• BuddyPress External Group Blogs:  ”Give group creators and administrators on your BuddyPress install the ability to attach external blog RSS feeds to groups. Blog posts will appear within the activity stream for the group. New posts will automatically be pulled every hour, or every 30 minutes if someone specifically visits a group page.”