One of the account is
Wolf_Pack which was removed from BitMixer by Lauda and was further removed from Byteball Signature Campaign following spammers list sent by Lauda.
-snip-
Nice find. Everything leads me to believe that they are definitely connected. I've been checking my list, and it seems that all of those were enrolled in Bitmixer at some point. I have tagged every account for severe abuse of signature campaigns. I've already updated all of my lists and added those to the permanent blacklist.