i read some books about cosa nostra. it stated that a mob boss never order a hit directly. someone under his rank pass this order to the executioner. my question is: some movies like the godfather, and i believe in real life too (i heard the story somewhere), the don order a hit directly to the executioner without his middleman.

i'm confused. can anyone explain this to me? which one is true? or both are common practices in the world of cosa nostra?