COLUMBIA, S.C. — A follower of the Proud Boys extremist group has been indicted by a federal grand jury for threatening the lives of President Joe Biden, Vice President Kamala Harris and two South Carolina federal judges. Eric Rome, 33, an inmate in the S.C. Department of Corrections, also sent letters he said contained anthrax to the U.S. Supreme Court and a federal courthouse in Portland, Oregon, the eight-count indictment said. Rome made some of the threats by telephone while an inmate in the S.C. Department of Corrections, the indictment said. Rome, who is being held at the maximum securit…