whistleblowers

noun
  1. 1

    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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Source: https://en.wiktionary.org/wiki/whistle-blower, https://en.wiktionary.org/wiki/whistleblower, https://en.wiktionary.org/wiki/whistleblowers