When someone big
wants someone dead
they call in a professional
This isn't about slipping a couple of Gs to some local punks who will gladly fire off their Uzis in a drive by. This is hiring someone who kills for a living. Someone who will use a proper silencer, teflon coated bullets and a bit of planning. Someone who will stake a place out, use suitable disguises and not leave a trail. Someone who will not expect payment without providing proof that the job's done: say $100,000 for a polaroid of the deceased.
You use a professional hit when you mean business.