Moscarelli:

Please correct me if I am wrong, but Sonny couldn't have witnessed Vito kill Fanucci because Sonny was just a small child at the time, plus, Vito was alone in Fanucci's apartment building when Vito killed him. Did you mean another person that Sonny may have witnessed?

~~ Lollie

"Sono una roccia; Sono un'isola...una roccia non ritiene dolore; un'isola non grida mai."