Action to annul an arbitration award. Failure to comply with the arbitrator's duty of disclosure (Article 14, § 1º, of the Brazilian Arbitration Act). Arbitrator who failed to disclose, during the course of the arbitration proceedings, that he had been an employee of one of the parties. Nullity of the arbitration award, as well as of all other acts performed in the arbitration proceedings (Article 32, II, of the Brazilian Arbitration Act):