BuddyPress.org

@trevorscottcarpenter, there’s three ways I can immediately think to do this…

1. Create a custom group component that isn’t a “forum.” Extend out the Group API to include a new sub component specifically that does what you want it to.

2. Create a plugin for BP forums to allow for “private” forum topics. Have it hook into the activity filters and actions and stop those processes from happening so they don’t appear in the site wide activity. This doesn’t prevent non-group members from interacting with the topic however.

3. If you’re okay with having the entire group forum be “private” but need the groups to be “public” then check if a user is a group member before displaying the forum. If not, create a message and redirect them to group root.