Question: Over the weekend, one user appears to have cast close votes on all of the open questions under the [disputed-review-audits](/questions/tagged/disputed-review-audits "show questions tagged 'disputed-review-audits'") tag as duplicates.

I could see this action as being constructive if we are trying to get rid of disputed review audits from meta. On the other hand, I could see blanket actions such as flagging or voting to close all questions under one tag as destructive.

What are our policies regarding this action?

Answer: 
Consider the two situations that assume that someone searched before hand:

1. You search and find a question (or two, or three) that is complaining about a review audit. Each of these questions is still open.
2. You search and find a question (or two, or three) that is complaining about a review audit. It is closed as a duplicate of another post about that particular queue. That is closed as a duplicate of the 'how should you review that queue' post.

In which situation does the person who searched first get more information about what the answers will be *before* the question is asked? If you selected #2, you are probably right. As much as we love giving the same answer again and again (you clicked no action needed on a question that wasn't even close to being grammatically correct), the goal is to give the next person who searches first the answer. Duplicates serve this purpose.

That's all assuming that the person searches first... This is Stack Overflow (and we know how often people search first on the main site, why expect meta to be different?)
It depends on the purpose of the disputed-review-audits tag. The description says "*For questions related to specific review audits*". If that description is correct, there is no way it could be a duplicate UNLESS you are posting twice about the same review audit. If the policy is that you should just look for general information about a similar review audit failure, then the description (and other places on the site) should be changed. There are many places on the site that encourage users to post here if they disagree. It is strongly implied that moderators will review your specific case if you post here (as an appeals process of sorts) rather than getting marked as a duplicate.

EDIT: I would also note that there seems to be some inconsistencies on some of how these are handled. Without naming names, some are marking things as duplicates, while others appear to be lenient and reverse these decisions.