[1] Here is the International Consortium of Investigative Journalism (ICIJ), which worked on the Panama Papers and Paradise Papers. It is based in Washington, DC and works closely with news organizations in the US and around the world.
[2] Here is a specific story that came to mind, where a Washington Post journalist would not release a scandal story because there was not enough evidence. In fact, they even investigated the source and discovered that it was sting operation trying to prove the the Post has low integrity.
Can't downvote replies to ones own comment. Your comment was downvoted by others due to the "A lot of them get a big hit then disappear or become complacent in “news journalism”" remark and your accusing comment above is just inviting further downvoting.