U.S. Expands Mueller Election-Fraud Case Against 13 Russians

(Bloomberg) -- American prosecutors expanded an election-fraud case against 13 Russians that was first brought by Special Counsel Robert Mueller, adding details to flesh out how the defendants allegedly defrauded the U.S. by interfering in the 2016 U.S. presidential race.The superseding indictment is the latest signal that U.S. prosecutors are aggressively pursuing matters set in motion by Mueller’s investigation of Russian election interference -- even as the Justice Department is also co