Wrongdoer's bane

• Employee who calls out bad practices, say
• Company informer
• Person with inside information making public some illicit activity

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 ...

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

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 ...