So, let me get this straight. You were being paid under the table? I'll give you a good advice. Just try to blackmail the sand negro and the dothead. Tell them that if they don't give you your hard-earned cash, you'll take it to the INS. Just a threat, mind you. If they don't buckle, then you got no choice but to give up and all that $$$ you deserved bites the dust. The restaurant has already committed crime by hiring you in the first place if you are not supposed to work legally.