Three men who plotted to attack electrical substations in a white supremacist attempt to sow national unrest have pleaded guilty to providing material support for terrorism, the Justice Department announced Wednesday. Federal prosecutors in Ohio said the three planned to disrupt the power grid to sow civil unrest and economic uncertainty in pursuit of their cohort of white supremacists. They hoped to cause trouble and start a race war, but the plot never really got beyond the planning stage, prosecutors said. Christopher Brenner Cook, 20, of Columbus, Ohio; Jonathan Allen Frost, 24, of West Lafayette, Indiana, and Katy, Texas; and...