After the death of Sonny Corleone, Vito Corleone and the heads of the Five Families formed a ceasefire but Barzini and the other familes kept chipping away at the Corleone business and rackets, Michael Corleone was back from Sicily and acting head of the family with his father Vito as acting consigleire and he appointed Rocco Lampone and Aldo Trapani as his caporegimes to bulid secret regimes to be used in a emergency.