A Whistle Blower is Anyone who has and reports insider knowledge of illegal activities occurring in an organization. Whistle-blowers can be employees, suppliers, contractors, clients or any individual who somehow becomes aware of illegal activities taking place in a business either through witnessing the behavior or being told about it.
Source - http://www.investopedia.com/terms/w/whistleblower.asp
To check wrongdoing in markets, the National Stock Exchange (NSE) has put in place an anonymous whistle-blower mechanism on the lines of the Dodd Frank Whistleblower Programme in the US.
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The following link can be used access the NSE's Anonymous Tip off Portal -
This word is suggested by Vinita Jagannathan (PGDM 2013-15)