The drama offers a case study in how Elon Musk’s team sought to run a critical government agency through misinformation and social media blasts — and how longtime employees responded.Elon Musk stood before a giant American flag at a Wisconsin political rally in March and rolled out an eye-popping allegation of rampant fraud at the Social Security Administration. Scammers, he said, were making 40 percent of all calls to the agency’s customer service line. Social Security employees knew the billionaire’s claim had no basis in fact. After journalists followed up, staff members began drafting a response correcting the record. That’s...