A controversial letter sent to President Joe Biden, in which the National School Boards Association (NSBA) asked that some parents attending school board meetings be considered domestic terrorists, was the final straw for the Pennsylvania School Boards Association (PSBA). The letter (PDF) prompted the Department of Justice to announce that the FBI and U.S. attorneys would discuss ways to address threats against school employees and board members, a task traditionally left to local law enforcement. After what it describes as “significant deliberations,” the PSBA voted unanimously to withdraw from the National organization and sent a statement (PDF) to its Pennsylvania members Thursday, explaining the decision. “The value of the NSBA federation membership has been questioned numerous times over the past several years both within Pennsylvania and amongst many other state school boards associations,” the statement to members says. “This misguided approach has made our work and that of many school boards …