I would also assume that a place like Louie's was the sort of restaurant where witnessed became deaf, mute and blind, wouldn't you??

Police Interrogator - Tell us what you saw
Louis' Waiter - I bringa the to gentlemen some wine, they speaka the Italian but I no listen, I no hear nothing.
Then I bringa the tall man my veal....madonne, you shoulda taste my veal. Itsa best in the city. The recipe comes from my mama in Napoli...Itsa beautiful veal.. we soak it in...
Police Inspector - What did you see? Did you see any one shoot these two?
Louis' Waiter - I no seea nothing. I serve the food then I turn around and then I hear a big noises.
Police Inspector - How many shots did you hear?
Louis' waiter I'm notta so sure they were shots. Me? I never shot a gun so I dont know what shot sounds like. Was a lot of big noise that firghtened me, so I no a look.
Police Inspector - Did you see anyone leave the restaurant after you heard the noise?
Louis' Waiter (poitining to Sollozzo and McCluskey, now in body bags) Notta thesea two!
Police inspector - then what about the third man?
Louis' waiter - He was a no longer there.
Police Inpector - Did you see him leave?
Louis' waiter - I saw someone leave, but I dont know if it was the other man. Maybe he lefta before.
Police inspector - Did you see him drop this gun?
Lois' waiter - I nevera see no gun until you showed it to me.