Lorenzo Carcaterra said this quote
“ A gangster must always be prepared to kill a friend. It is one of the many open secrets of the business, since it is the truest test of his ability to rule and command the respect of his crew. To eliminate a sworn enemy requires little more than opportunity, luck and the willingness to pull a trigger. But to end the life of someone once considered close, regardless of any previous betrayal, requires a determination that few men possess. ”