Basically Chickie Narducci who was a captain at the time was really hell bent on becoming boss similar to how Tony Bananas felt when angelo was still boss. Chickie was a big team earner and millionaire but he really wanted power. So he got Pete casella(the underboss) involved in this plot. Obviously they didn't have commission approval or the backing of the Genovese family so that didn't work out. Peter Casella was spared and told to retire to florida. However Salvie testa took care of Chickie and rocco marinucci who was Casella's driver and the one who detonated the nailbomb.