Well, his father was in critical condition in the hospital. His house was garrisoned by button men and his brother was a target of any number of the other families' button men. One Corleone wiseguy had turned traitor and was murdered for it; another had been eliminated. So, I imagine he didn't know.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."