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It's a channel on steemit.chat where the members 'nuke' (=warn and downvote) posts that are blatant plagiarism mainly.

ha. And will they help if a whale goes rogue and flags my account?

I believe so, it's up to their judgment to flag a post or not depending on the arguments brought to the table I guess. For that type of behaviour I would suggest the steemitabuse channel though as it does sound as an abusive action from that whale. What they could do is upvote to counteract the effect