A big problem arrived in Fulton County district attorney Fani Willis’s email inbox on the afternoon of Nov. 16, 2021. It was a legal notice from an attorney representing Amanda Timpson, a former member of Willis’s executive staff who had been blowing the whistle on the district attorney’s office for allegedly trying to mishandle federal grant funds. Willis, the eight-page letter stated, had violated a slew of whistleblower protection laws when she reassigned Timpson to serve as a glorified file clerk following a brief meeting in July 2021 in which the district attorney refused to hear Timpson’s allegations. Timpson believed...