Technically, Chicago kind of(not totally) put me in my place on that in my thread about Accardo being my favorite mobster. I think it's one of those things where you can make your own assumption but Giancana was mentored in by Paul Ricca who shared power with Accardo even while Ricca was in prison. Giancana I would say for a period of time was the big guy on top with Accardo right next to him as his advisor. Although I believe Accardo still signed off on mostly everything Giancana did as Boss. In the end Giancana didn't want to share, even after being tossed to Mexico for 3 years he still had an enormous amount of power and had alot of business ventures outside the U.S.. One being casinos in Israel that he profited on alone without any sharing with the Outfit. Giancana was certainly a boss on his own right, but I firmly believe that alot of guys didn't answer totally to him and always kept their loyalty with The Big Tuna. If I was Accardo I would have been happy to sit in the back seat while Mr. Flashy Giancana drove the car.

I think an even more interesting debate would be who clipped Giancana? CIA or Accardo?