In a private call with federal prosecutors across the country, Attorney General William Barr’s message was clear: Aggressively go after demonstrators who cause violence. Barr pushed his U.S. attorneys to bring federal charges whenever they could, keeping a grip on cases even if a defendant could be tried instead in state court, according to officials with knowledge of last week’s call who spoke to The Associated Press on condition of anonymity. The Trump administration’s crackdown has already led to more than 300 arrests on federal crimes in the protests that erupted following the death of George Floyd.