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Spaces with set permissions or private groups would work.
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Hi! While you can't build any hierarchy with groups, (i.e. subgroups) I think they would still work nicely for this. You could easily set them up as Private or Secret and invite only the appropriate people.
You could also link them in your global nav, on your homepage, or on some place pages, to give them some real estate and help make them findable.
If you are working with spaces, you could certainly build subspaces - but just keep in mind the permissions will be handled differently (through the admin console). IMHO groups would be a bit cleaner for this, but it all depends on your use case & how you want to set it up