WCCO Radio, Inc. v. National Labor Relations Board

reversing district court’s granting of a preliminary injunction against the revocation of a security clearance | “voir dire ... need only provide ‘some basis for a reasonably knowledgeable exercise of the right of challenge whether for cause or peremptory’ ” | evidence of prior sexual abuse of different child should not have been admitted but the error was harmless | tax court’s holding that taxpayer investment losses were not deductible because transactions were “factual shams” reviewed for clear error as to finding the transactions were shams and de novo as to the application of the proper legal standards for making the sham determination