I would start with your state's labor board and your state's department of revenue. With apparently no official employee paperwork being completed, it would be quite easy for them to "withhold" taxes from your paycheck and then it never ends up in the state's hands. Failure to pay wages due is obviously a violation of your state's labor laws. You might even fully encourage your state's liquor board to inquire whether the bar is being compliant with applicable liquor laws as well pertaining to its employees.
Is it possible they saw how much you drank and deducted your tab? Sorry, bad joke.
