Thank you @smidge-tv for your information about bots.
https://www.steem.center/index.php?title=List_of_Bots
seems to be a good start point to search bots I want.
Oh, you already had help from professional programming service from
https://www.fiverr.com/incloudo
Great.
Do you happen to have plans to auto-comment to @badcontent comments to announce our fight against such bad guys?
I think that at this point to drop their witness ranking is the most critical to the bad guys.
If I can have such voting bots, I will.