Most of them were through the misuse of the outside sales exception (financial services, mortage industry and others), although other exempt exceptions have have been involved. Past that, maybe your employer is a fool or maybe the employer is a knave So one way or another, your employer is doing something wrong
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Failing to give you a raise, however, is not it
The above answer, whatever it is, assumes that no legally binding and enforceable contract or cba says otherwise.
Or just home document violations, such as unpaid overtime When you eventually leave this employer, and you probably will, file a wage claim on your way out the door