My wife worked at a restaurant that didn't keep payroll. Most of the kitchen was paid under the table. Employees wouldn't get paid unless they tracked down the manager and asked for a check. Checks bounced. It was all clear as day. She reported all of it and nothing came of it.

I'm half expecting employers to start taking advantage of this. They can get away with a lot before it rises to a level that is addressed. It's incredibly prevalent in restaurants because people will quit and get a new job rather than deal with the problem.