It was Neri's father in law that petitioned the Corleones to intervene in Neri's legal case. Clemenza told Tom about him and it was Tom who first described him as another Luca. After an apprenticeship in Clemenza's regime, Clemenza described him as another Luca also. He was then made responsible to Michael.

"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."