I have been trying to find an authoritative definition of "whistelblowing" but none that I find say it only applied to illegal activities. For example:
"The disclosure by a person, usually an employee in a government agency or private enterprise, to the public or to those in authority, of mismanagement, corruption, illegality, or some other wrongdoing."
Whistleblowing legal definition of Whistleblowing. Whistleblowing synonyms by the Free Online Law Dictionary.
Most the definitions say something like "illegality OR wrongdoing".
Wrongdoing is definitely a moral call.
While I don’t consider Manning a whistleblower since he didn’t even know what he was leaking, I DO consider this man a whistleblower. He made a conscientious decision to leak information on a specific program that he felt was morally wrong. Now, the information was classified so he definitely broke the law, but it is still whistleblowing.