ANDREW CABALLERO-REYNOLDSProtesters and activists stand at attention as the national anthem is sung to open a Loudoun County Public Schools board meeting in Ashburn, Virginia, on Oct. 12. Loudoun County school-board meetings have become tense recently, with parents clashing with board members over issues such as the teaching of critical race theory and the response to in-school sexual-assault allegations. Directives from the U.S. attorney general have also angered parents of late.