None. It's futile.
Politicians are necessary for any government. Sure they lie and scam, but you know, society would barely function without them, and if they were all gone, more would have to rise to take their place controlling the villains of the world.
Marketers need to exist unless you want everything to be indie or word-of-mouth. Getting rid of marketers is stupid.
Law enforcement. Really? No. I'm not even going to explain why that is a moronic idea.
Tax collectors, again, I actually want a functioning government so I don't get constantly screwed over.
Prostitution, like someone else said, more prostitutes will come (hurrr) and people should be able to do what they want with their bodies.
Soldering. Okay, I had to look up soldering to make sure it didn't have a secret definition, and I assume you mean soldiering? Yeah, no, without any army, governments would still fight each other, and would just be forced to do so through drafts or militias, so those who don't want to fight would be forced to anyway.
So, my vote is on Activision CEO.