One case that stands out today is that of the Washington Post and its editorial/journalistic direction since it was bought by Jeff Bezos for $250 million in August 2013. This was preceded by Bezos' AWS getting a $600 million CIA web services contract in March 2013. This seems to have resulted in a rather striking shift in coverage and editorial opinion at the WaPo.
Prior to this, the Washington Post had published a striking expose of the national security state, by reporters Dana Priest and William Arkin, entitled "Top Secret America". Here's legendary nuclear weapons historian Richard Rhodes reviewing the book that came out of that effort in 2011:
https://www.washingtonpost.com/entertainment/books/top-secre...
> "“Top Secret America” originated in a 2010 Washington Post series of the same name that set out to enumerate how many Americans held top secret clearances — about 854,000, the Post’s investigative team found, more than the population of Washington. The book is far more ambitious than was the series, however, and makes the team’s investigations available in detail to those of us who live beyond the Beltway..."
Since the change of ownership at the WaPo, with the new owner probably interested in the perpetual renewal of that AWS CIA contract and expanding such services to all the other intel agencies, I can't think of anything even remotely similar being published at the Post. Note this doesn't mean WaPo employees have gone back to being CIA agents, rather that the editorial board has realized that publishing any more such exposes are probably not going to help with their future careers at the Post.
Another Church Committee with the power to subpoena all the relevant parties under oath about this situation might be a good idea, but don't hold your breath.