Exporting group members


I'm wanting to do a review to make sure I have everyone placed in the right buckets. I can dump a user list but there's no group membership details included. I don't see any automated way of dumping group members to CSV for review. The best solution i found is stupid -- open each group and copy-paste the html into excel and then extract emails that way to cross-reference.

Is there a smarter way I'm not aware of? Thanks!