The ACLU likely won't help unless the problem is with you being a woman, a quadrapalegic, black or some other more politically correct minority. Discrimination is discrimination, but it is seldom viewed that way. The ACLU has done some great things, but they also discriminate unfairly at times just like everyone else.
If you end up following through with some kind of wrongful termination action against your former employer, I'd like to know what happens with that. It would be nice to see some justice come out of this.
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Things aren't always the way they seem-- At least that's the way it seems