The Southern Poverty Law Center told a federal court on Tuesday that law enforcement agencies have long known that the nonprofit paid informants to report on the movements of hate groups, rejecting assertions by the Trump administration that the nonprofit steered money to the Ku Klux Klan and other extremist groups without the knowledge of authorities. The Alabama-based nonprofit was indicted last week on charges of fraud and money laundering. Prosecutors said the group misled donors by using their money to pay informants who served as leaders in the very hate groups the organization was founded to fight. In its...