whistleblower

Words with a similar base: whistleblower

'whistleblower'

[whistle_blower.n.01] as in: an informant who exposes wrongdoing within an organization in the hope of stopping it

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Examples:
the law gives little protection to whistleblowers who feel the public has a right to know what is going on
the whistleblower was fired for exposing the conditions in mental hospitals