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I'm not ready to provide a complete analysis of the situation yet, so I'll go over Arandor separately. We can execute him as a Necromancer, of course, but there are three scenarios in which he isn't a Necromancer:
1) The Necromancer was gathering information.
2) The Necromancer visited Arandor.
3) The Necromancer performed dark magic on Nefelu, but she died before it took effect (but this needs to be confirmed by Revan).
Added 2 minutes later
Execute the Heroist. I'm sorry, but there's no other option now, as the Mafia block is gone.
Megerson, sorry for barging in yesterday; it seems I was blocked last night, and I wasn't checking on Shizuo...