Whistle-blower
Whistle-blower is an employee, former employee, or member of an organization, especially a business or government agency, who reports misconduct to people or entities that have the power and presumed willingness to take a corrective action. The misconduct may be a violation of a law, rule, regulation and/or a direct threat to public interest, such as fraud, health/safety violations, and corruption.
Source: Wikipedia.org: Whistle-blower 
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See also: Accounting whistleblower; Bio-tech whistleblower; Blowing whistle; Environmental whistleblower; ERA whistleblower; Federal agency whistleblower; Federal whistleblower; Finance whistleblower; Financial whistleblower; Government whistleblower; NRC whistleblower; Nuclear whistleblower; Nuke worker whistleblower; Pharmaceutical whistleblower; Protection for whistleblowers; SOX whistleblower; Whistleblower; Whistleblower attorney; Whistleblower case; Whistleblower claim; Whistleblower fraud; Whistleblower law; Whistleblower lawyer; Whistleblower protection; Whistleblower Protection Act; Whistleblower retaliation; Whistleblower rights; Whistleblower shareholder