Seeking to clarify a lot of things being discussed in this thread.

The family hierarchy as of 1980:

At the time of Bruno's death the capos in the family were John Cappello, Santo Idone, Alfred Iezzi, Frank Narducci, Nicholas Piccolo, Joseph Scafidi and John Simone. Caponigro retained control of the North Jersey crew which had split off from Simone's regime around 1971 or 1972. Dominick DiNorscio had been acting for Caponigro in the late 1970s and I believe was acting at the time of the Bruno murder (the North Jersey crew did not have an official capo after Caponigro until Ralph Napoli was promoted in 1981). Simone spent a considerable amount of time in Florida, leaving Charles Costello and Carl Ippolito in charge of his crew at various times. By 1980, however, Ippolito's mental state was deteriorating (he was declared unfit to stand trial when indicted on RICO charges in 1981) and if I remember correctly Costello was acting for Simone in 1980.

Identified suspects in the Bruno murder:

Caramandi states that Sindone and Simone were active conspirators in the Bruno murder. Caramandi claims Sindone would become Caponigro's underboss though Fresolone claims Patty Specs Martirano was lined up to be Caponigro's underboss. Sindone and Caponigro allegedly had a hit list of their own that included Scarfo and Narducci. Sindone and Simone visiting Stanfa in hospital could have been a meeting of conspirators or it could have been simply them informing him that he wasn't a target and not to worry. It is harder to believe Stanfa was involved as he wasn't Bruno's regular driver, he could have very easily been killed in the crossfire, and Bruno had to roll his own passenger window down as the car didn't have automatic windows. Simone was killed in part because he went to the Gambinos after the murders of Bruno and Caponigro in an attempt to gather support in becoming boss himself, though New York was already backing Testa so the Aurello crew killed Simone on Philadelphia's behalf. In his testimony, Leonetti identified Felix Bocchino and Anthony Ferrante as being involved in supplying the weapon to be used in Bruno's murder, and in his book he also identifies Ralph Napoli as being involved in supplying the weapon. All three were spared by the new administration. Scarfo spoke up on Ciancaglini's behalf and said he was 'innocent of [Sindone's] tricks'. Caramandi states Ciancaglini was involved in setting up Sindone to be murdered. Raymond Martorano was at Cous' Little Italy on the night of the murder and, when talking to Mario Riccobene, admitted that he had been involved in the murder of Bruno. Victor DeLuca was seen outside Bruno's house on the night of the murder though his involvement seems unlikely as he never mentioned the assassination after turning government witness to testify against the Riccobene brothers. George Anastasia believes Alfred Salerno was likely the shooter, but Fresolone states that Caponigro himself pulled the trigger. Those believed to have been involved in the Bruno who were killed all had other motives for their murders. Caponigro was killed to hide the Genovese family’s involvement in the scheme. Salerno was killed because he was unfortunate enough to go to New York with Caponigro. Simone was attempting to gather support from the Gambinos to become boss. Sindone held a vote of the capos to become boss himself. Stanfa was in prison before things would play out to see if he would be killed or spared. Bocchino, Ciancaglini, Ferrante, Martorano and Napoli all professed their loyalty to the new Testa administration.

Bruno’s tensions with Scarfo:

Bruno got into a feud with Testa and Scarfo towards the late 1970s over union control in Atlantic City (Bruno wanted different people in key union positions than Testa and Scarfo’s candidates). When Bruno tried to get Scarfo to side with him against Testa, Scarfo refused and the feud intensified. Scarfo took security measures in his apartment building in the event that someone would try to kill him and once suspected John Calabrese of trying to set him up to be murdered on Bruno’s orders.