Scarfo did not kill Volpe, but he is one of the mobsters that beefed about Volpe and was not the only one, both the Gambinos and Genovese families had beefs, Elisabeth does not get mentioned but Fat Louie had some sort of beef with Volpe. This got back to Buffalo who already had complaints from Canada long before Volpe moved to AC. The root of this is the Pieri's. Salvatore was one of Volpe protectors. When he died Joe Sr set the wheels in motion for Volpe to be killed. Scarfo never pulled the trigger or was involved in the hit.