Discrimination laws in New York State and Federal discrimination laws do apply to at-will employers. However, simply being treated differently is not sufficient for a discrimination lawsuit, you will need to demonstrate that the disparate treatment was motivated by discrimination against a protected class. These protected classes would be groups such as national origin, race, religion, disability, age, gender, sexual orientation and so on.
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I still don't see discrimination in your fact pattern but use the Find A Lawyer tab on this web site to look for employment lawyers.
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A union could have provided the type of job protection that would have prevented what the company did. But I do not think a lawyer can correct the problems you describe.