The blowing of whistles is the bearing of light on what is corrupted and/or should not be occulted.
“The conscience and common sense of the nation as a whole keep down the evils which have crept into the working of the Constitution, and may in time extinguish them. Public opinion is a sort of atmosphere, fresh, keen, and full of sunlight, like that of the American cities, and this sunlight kills many of those noxious germs which are hatched where politicians congregate. That which, varying a once famous phrase, we may call the genius of universal publicity, has some disagreeable results, but the wholesome ones are greater and more numerous.”
– James Bryce, The American Commonwealth (1888)