I am kind of surprised billionaires and CEOs don't order each others' killings more often. I was doing homework one night and the building next door's top 2 floors were blown up because some banker had a hit placed on his head. So perhaps I have pretty low expectations on what powerful people without morals can do.
Any random guy with enough capital can short the company stock and then place a hit on the CEO.
I would expect stuff like that to happen super often but I don't think I have even heard of one real case like this.