Whistle-blower

noun, slang

Definitions

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. US, slang

    "We owe it to a small group of brave whistle-blowers that we know about the infractions at all."

  2. 2
    an informant who exposes wrongdoing within an organization in the hope of stopping it wordnet

Etymology

From whistle + blower, referring to a police officer blowing their whistle on observing a violation of the law.

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