Will Rosenzweig joins a growing list of former prosecutors and federal agents who have gone to court to contest the purge of law enforcement deemed disloyal.One day last September, a right-wing influencer named Natalie Winters posted what she billed as an “EXCLUSIVE” on social media: A federal prosecutor in Miami overseeing a fraud case against “MAGA patriots” had once written a blog with comments critical of President Trump.Ms. Winters, who has hundreds of thousands of followers, addressed her message to the accounts of senior officials at the Justice Department. Her demands for the prosecutor, Will Rosenzweig, could not have been...