Just because you've been discharged from a job unfairly, that doesn't mean you can sue for wrongful termination. To be considered wrongful termination, the employers must have fired or laid you off illegally -- without justifiable cause and without following standard procedure.
Even if you know for sure you've been a victim of wrongful termination, it might be difficult to prove it in a court of law. Your former employer will almost certainly have invented a reason for firing you, or may have used your previous behavior as an excuse.