Donald Trump’s appointees at the Department of Justice have removed all of the senior civil servants working as managers in the department’s voting section and directed attorneys to dismiss all active cases, according to people familiar with the matter, part of a broader attack on the department’s civil rights division. The moves come less than a month after Trump ally Harmeet Dhillon was confirmed to lead the civil rights division, created in 1957 and referred to as the “crown jewel” of the justice department. In an unusual move, Dhillon sent out new “mission statements” to the department’s sections that made...