I don't know whether anyone could answer your specific question, given the broad and vague nature of your post, but maybe this will help: If you tell the press and/or the public nothing but the truth, you won't be defaming anyone, and at least you shouldn't have to worry about losing a defamation suit.
If you report unauthorized or illegal activity to authorities, again you have nothing to fear, so long as you are truthful.
You should, of course, discuss these plans with your attorney and get sound advice and approval before taking this kind of action,
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