I can answer this from personal experience. Very relevant experience since the article notes in line 1: "...frauds in the subprime mortgage market, the AIG bailout..."
I worked at AIG's Credit Default Swap group in NYC in 2007/2008 and someone in IT noticed strange audit records showing Operations/Accounting users manually changing prices for no documented reason. The person in IT foolishly copied the logs into an email and emailed some managers inquiring why. You might recall the company was under investigation for massively over-marking their derivatives so any accusation around derivatives prices being manually overridden without an audit trail is quite damning.
Within 24 hours, he was accused by one of the Operations/Accounting users of assault (supposedly a mouse was thrown at her.) There were no eye-witnesses, a total he-said-she-said. Despite that, he was walked out of the office soon after. He had no prior HR records/demerits. He was on an H1 which meant he'd be sent back to China within two weeks if he didn't find another job.
Despite having a printout of the email which likely initiated this retaliatory accusation, HR was not interested in any email. They seemed to be more interested in squashing the original concerns than investigating it. HR did not interview anyone besides a few of the accusers. It seemed like a professional hit job (cover-up?)
The message to the overall group was clear and chilling -- keep you mouth shut and don't look where you should not. I tried to switch departments immediately, as did others. Luckily the entire group was re-org'd and much better and more fair management took over. Regardless, I never publicly mentioned the story (I am now posting it for the first time since many of the people involved are retired and I'm in a different industry.)