whistle-blower ( synonym found)
Definition of whistle-blower:

(n) : one who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer
"we owe it to a small group of brave whistle-blowers that we know about the infractions at all."
Definition of whistle-blower:

(n) : one who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer
"we owe it to a small group of brave whistle-blowers that we know about the infractions at all."
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