The poor state of the members page has been pointed out many times already. Now the spammers are exploiting the shortcomings.
You have to remove every account separately. There is still no sock puppet detection.
What's worse: Deleted accounts are not removed from the communities. In a 5k community I just found ~200 dead accounts. You cannot clean it up in steps, because there is no pagination, so you cannot come back later to page 10 or something like that.
I am fully aware that moderation has the lowest priority on Google+. But this is ridiculous. All of this could be solved with a few very simple changes:
- Sort members by the date they have joined the community.
- Remove all memberships of deleted accounts automatically.
- Enable pagination on that page.
- Limit memberships for an account to 10 per day and 50 total.
This isn't rocket science. I have written such code multiple times. Every programmer can do that before breakfast. An intern might need a whole day. Google, do you have interns? Please?