After the 2008 financial crisis, the Fed hired Carmen Segarra and placed her inside Goldman Sachs, one of the "too-big-to-fail" banks central to the crisis.
She was an examiner: paid by the Fed to supervise what was going on inside the financial behemoth. She was fired after a few months. She claimed she was fired for refusing to back down from a negative finding about Goldman and unsuccessfully tried to sue.
From the story:
"At the bottom of a document filed in the case, however, her lawyer disclosed a stunning fact: Segarra had made a series of audio recordings while at the New York Fed. Worried about what she was witnessing, Segarra wanted a record in case events were disputed. So she had purchased a tiny recorder at the Spy Store and began capturing what took place at Goldman and with her bosses."
The recordings reveal the inner workings of the nation's financial regulatory body.