Thank you for the information and your question, although I am not certain what kind of case you are thinking you might have. If you are asking if giving other employees raises and not you is unlawful, then the answer is generally no. However, if the action violates a contract, written company policy or is motivated by discrimination
because of your sex, race, national origin, age (over 40), disability, religion, pregnancy or AIDS/hiv status, then it would be unlawful.
So, if your situation falls into the exceptions I mentioned, you should sit down with a local employment law
attorney and discuss all of the details to see whether they think you should file suit. But again, just to be clear, an employer being unfair or preferential is unprofessional and poor management, but not illegal unless it fits into the exceptions I mentioned.
Please feel free to ask for clarification.