I think a better alg is the author of the max downvotes on one person.
Yes, I believe that this is similar to what I have suggested. A mass downvoter would be a strong outlier on the 30-day downvote histogram (# users who downvoted vs # downvotes they gave) of a given user.
Below is a message I just got from jackk. Some specifics have been redacted 1) so that we can discuss general policy rather than the details of this specific case 2) because presumption of innocence, just in case there happens to be an innocuous explanation to this.
So... thoughts? I have mod powers, but when I was granted them I was basically just told to use them to fight spam; there was never any discussion of any other policy, and I don't feel like I have the authority to decide on the suitable course of action without consulting the rest of the community.