Whistleblower — synonyms, definition

1. whistleblower (Noun)

whistle blower whistle-blower

whistleblower (Noun) — An informant who exposes wrongdoing within an organization in the hope of stopping it. ex. "the law gives little protection to whistleblowers who feel the public has a right to know what is going on" ex. "the whistleblower was fired for exposing the conditions in mental hospitals"

informant source