Federal prosecutors have charged more than 300 people with taking part in the Jan. 6 riot at the U.S. Capitol, the Department of Justice said Friday, and at least 280 of them have been arrested. "The investigation into those responsible is moving at a speed and scale that's unprecedented, and rightly so. Those responsible must be held to account, and they will be," acting Deputy Attorney General John Carlin said. On Thursday, acting U.S. Capitol Police Chief Yogananda Pittman told Congress of her concern that members of some of the same groups involved in last month's riot -- who said...