One who exposes wrongdoing

• Inside informer
• Person with inside information making public some illicit activity
• One discloses having broken elbow in Canadian ski resort
• Wrongdoer's bane
• Employee who calls out bad practices, say

Wiktionary Word definitions in Wiktionary
n. (alternative form of whistle-blower English)

Wikipedia Word definitions in Wikipedia
Whistleblower is a two-part IFTA -winning fact-based RTÉ drama which focuses on the Michael Neary scandal that erupted in the 1990s. Neary is a retired Irish consultant obstetrician / gynaecologist who gained notoriety when it was discovered that he had ...

WordNet Word definitions in WordNet
n. an informant who exposes wrongdoing within an organization in the hope of stopping it; "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 ...