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If you want to log who's in the group at a specific time (e.g. during a guild event), I believe there's GetUnitDisplayName('group1') (or group2, group3, etc) or some other similar function.
If you want to know whether they ever did any PvP, I imagine the leaderboard API would help, though you can probably only view the top 100 people or something in each campaign (and probably only home and local campaigns)
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