You were right though Gary, and explained it almost identical to how it is in the book. They originally thought Tony Accardo was behind the shooting because both he & Pilotto were called to testify for something, around the same time Pilotto was shot, so it was assumed that he was shot because people felt like he'd talk. But that turned out to not be the case, and Accardo & co. were outraged that someone tried to kill Pilotto.