I didn't feel like formatting this in here, so I will just link to it. It is a "point by point" case against Samy and how they think he is laundering money through this restaurant.
It is nothing official, just somebody who thinks that is what is going on.
Sammy screamed 'Don't call the police'. This was one of the only things he really stood up to his wife on. I think Sammy is involved in serious criminal shit and he doesn't want Johnny Law to come poking around and causing any disruptions to the money losing business here.
It is a pretty quick read-through, but again, it is all speculation. Something does seem quite off about the whole place though.