I wouldn't recommend @blacklist-a because there is no real appeal process and it is not obvious on which criteria downvotes are based. Like who are "serious members" of the community.
I can just suggest you to have a look at Redeemers where you can find buildawhale blacklist or the Steemit Defence League which are all worth to blacklist.
And @tard should be monitored by @patrice already so I think they are all blacklisted. I'll have a look myself and write her to do so if not. :)
Thanks! Will check them out, tip! :)
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