Whistleblower

A whistleblower (also written as whistle-blower or whistle blower) is a person, usually an employee, who gives information about a private, public, or government organization, that is seen as illegal, unsafe, or a waste, fraud, or abuse of taxpayer funds. 
Over 83% of whistleblowers report to a supervisor, human resources, or a neutral third party within the company. A whistleblower can also contact someone outside of the organization, like the media, government, or police.