A Texas judge Wednesday issued an order to block the Labor Department from enforcing its union “persuader rule.” Judge Sam Cummings granted a motion for summary judgement in favor of the National Federation of Independent Business and turned the temporary stay he ordered in June into a permanent injunction. In the one-page order, he said the rule “should be held unlawful and set aside.” The rule, finalized in March, would force employers to disclose outside consultants they hire to counter workers' union organizing efforts. It would require employers to report any action, conduct or communication undertaken — explicitly or implicitly,...