Is it unlawful to retaliate/fire employee who blewwhistle w/o knowledge of companywrogdoing

I was terminated from position on Nov 4th/10 for "not being a goodfit", not understanding my job responsibilities and for telling a Manager ( whom my company has a contract with) that a procedure for "contracted service my company manages has been amended"- which is truthful. I did not know this was unlawful nor was I trained or given any orientation in reference to the Contractual agreement/policies etc... I was given a bonus from my employer on Oct 20th (a few weeks later I'm fired"). I have had no disciplinary actions against me during my time employed. My employer also told this Manager/and other Managers -whom they are contracted with that I am on a "workplan"- which is a lie and not in my personel file. I do know that my supervisor was asked about the amendment and quickly after I was fired. The employee handbook states that "they use a progressive discipline policy and only terminate immediately for agregious, flagrant issues/violations. The handbook also says that employees are encouraged to file a grievance with the CEO/President if they feel they have been treated ubfairly. - My supervisor is married to the CEO/ President- so I don't believe I have the same option as other employees in the company. I cannot find any research on laws that protect someone who blew the whistle but did not know of wrongdoing by employer.