Any business doing this to their employees needs to be shamed and boycotted.

or as some would have it...undocumented workers. Lest you think the term "illegal immigrants" is derogatory, John Stewart just used the term last week on his show (not in a joking way); it's a legitimate term that means something different from "undocumented workers." Documentation is easy to come by, but despite that, the worker came into the country illegally, everyone knows it, and they can't get a job demanding a good wage or call attention to themselves. They cannot be put in a position where documents are serioiusly looked at or checked out.

But I don't know when or why the practice of tpping started. It probably started centuries ago in England or somewhere.