The seditious conspiracy charges brought by the Justice Department on Thursday against the leader of the Oath Keepers and other members of the right-wing group signal the government is prepared to take on an ambitious fight to show that they joined the Jan. 6, 2021, attack as part of a coordinated effort to deny President Biden the White House. The indictment contains the first sedition charges that have been brought following the riot and mark a significant escalation in prosecutors’ efforts by drawing a connection between the physical acts of mayhem that day and the broader effort by former President...