Persico believed that Aronwald, who had helped prosecute Persico, had been disrespectful to the Cosa Nostra. Killing a prosecutor was normally forbidden in Cosa Nostra tradition, but Persico wanted him murdered anyway. Cacace arranged for brothers Vincent and Eddie Carnini to murder Aronwald.
Persico believed that Aronwald's actions were a betrayal of the Cosa Nostra, leading him to order his murder despite the taboo against killing prosecutors.  Cacace facilitated this act by arranging for the Carnini brothers to carry it out.