In early 2006, Darcy Parmer began to worry about her job. She was a mortgage fraud investigator at Wells Fargo Bank. Her managers weren’t happy with her. It wasn’t that she wasn’t doing a good job of sniffing out questionable loans in the bank’s massive home-loan program. The problem, she said, was that she was doing too good a job. The bank’s executives and mortgage salesmen didn’t like it, Parmer later claimed in a lawsuit, when she tried to block loans that she suspected were underpinned by paperwork that exaggerated borrowers’ incomes and inflated their home values. One manager, she said, accused her of launching “witch hunts” against the bank’s loan officers.