Amid a long-running campaign by far-right communities threatening to attack the nation's power grid, domestic extremists cheered when two still unattributed shootings at North Carolina substations plunged tens of thousands of people into darkness. Beyond celebration, however, their comments called for more, bigger attacks targeting critical infrastructure on U.S. soil. Experts told Newsweek that the attack in Moore County, North Carolina, as well as in similar previous attacks across the country, may only be the start of a more destructive campaign. Prior to Saturday's attacks and in the leadup to the midterm election, Newsweek obtained documents demonstrating dozens of instances...