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They're only as private as you want them to be. The CoC and ToU still apply, but are enforced differently. You can talk about whatever you want, but if you violate the CoC/ToU and an admin finds out, you're asking for trouble.
Politics and religion are banned by the forum rules, not the CoC or ToU. Use the CoC and ToU as your guide. Talk about whatever you like, but understand that if you violate Bungie's governing documents, you're running the risk of something happening to you and/or your group.
So, once again, your groups are as private as you make them. Bungie will never look at it unless you give them a reason to.