What's the best way to leak from the press? Suppose a whistleblower inside, say, the NYT, has internal evidence that demonstrates some kind of negligence or malfeasance in the important task of informing the public?
Who would be the right party to leak to, for one thing? Another press institution?
Also, has anything like this ever, like, actually happened? If so, when? If not, why not?
The most recent act of negligence by a journalistic institution that has happened recently was reported by The Intercept (Glenn Greenwald's gig) about the Washington Post's reporting on how Russia was behind the "fake news" propaganda that was unfortunately in itself a sort of propaganda. To discover why, you'll have to read those articles yourself.
In any case, I think journalists typically keep each other in check. And, thankfully, in prestigious institutions you're judged by the quality of your work and whether or not it can be fact checked. Unfortunately, reported facts in the United States are about as big of a hand patting Barack Obama on the back after winning the next election. Everything is irony and nothing is sincerity.