or whis·tle blow·er
Origin of whistle-blower
Related formswhis·tle-blow·ing, noun
Examples from the Web for whistle-blowing
The disclosure of those addresses was not whistle-blowing; that was aiding China.
Those who suspect a colleague of fraud may be inclined to keep mum because of the potential costs of whistle-blowing.How Social Scientists, and the Rest of Us, Got Seduced By a Good Story|Megan McArdle|April 30, 2013|DAILY BEAST
But he likes the idea “that we could set up something for people who are nervous about their whistle-blowing.”
There was a lot of whistle-blowing and shouting and a lone shot which didn't seem to be aimed at him.And Then the Town Took Off|Richard Wilson