whistle-blower 
noun
A person who informs on a person or organization regarded as engaging in an unlawful or immoral activity.Nurses also may not report other nurses for fear of being perceived as snitches or labeled as whistle-blowers....
- They're trying to put in measures to help whistle-blowers point out wrongdoing at the United Nations without losing their job.
- Meet the new target for whistle-blowers and conspiracy theorists: big business.
Derivatives
whistle-blowing
/ noun & adjective ...- The strategy incorporates new policies to govern fraud, corruption and whistle-blowing in the city.
- Then another Commission official was forced out for whistle-blowing on budget fiddles.
- Has the Patriot Act so unnerved Spielberg that he thinks we're living in a police state where New Yorkers are afraid to be the insubordinate, whistle-blowing, pains-in-the-neck that they have always been?
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