WASHINGTON — The Southern Poverty Law Center paid reluctant white nationalists and Ku Klux Klan members thousands of dollars in donor money to remain in the notorious hate groups — even making them whole for money spent on cross-burnings, the Justice Department alleged in a shocking superseding indictment filed Tuesday. The feds initially charged the once-venerable civil rights organization in April with 11 counts of wire fraud, false statements to a bank, and money laundering conspiracy. Tuesday’s superseding indictment, filed in Montgomery, Ala., federal court, lays out some of the stories of informants who were paid in money the SPLC raised from donors...