Yes. It is unlawful for agencies to take or threaten to take an adverse personnel action against an employee because he or she disclosed wrongdoing. Adverse personnel actions include poor performance reviews, demotions, suspensions, terminations or revocations, and other forms of retaliation for filing an appeal, complaint, or grievance. Other types of protected activity include helping someone else file or testifying on his or her behalf, cooperating with or disclosing information to the Office of Special Counsel or an inspector general, and refusing to obey an unlawful order.
Protections for Federal employees include the Inspector General Act (IG Act) of 1978 (http://www.archives.gov/about/laws/inspector-act-1978.html), as amended, and the Whistleblower Protection Act of 1989.