Removing people from digest subscriptions

I have a couple of groups that hate that their members opt in for the email digests. We've scrubbed the digest subscription short cuts from their pages, but the members can still subscribe from their profile settings. I think I've asked before if there was a way to turn off digests on a group by group basis, and I think the answer was no. So is there any way we can see who is subscribed to digests and purge them from the two groups. I do have a nuclear option of removing their memberships and breaking the subscription that way, but I'd rather not go that route.

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