An NLRB judge ruled that arbitration confidentiality pacts are illegal in reviewing Pfizer Inc. v Rebecca Lynn Olvey. In May 2016, the company announced to its employees that they are subject to arbitration disputes and the confidentiality clause, which restricted parties from speaking out about the arbitration proceedings. Judge Locke held that while arbitration proceedings are legal, it is illegal, according to Section 7 of the National Labor Relations Act (NLRA) to restrict employees from discussing terms and conditions of employment, including arbitration.
See "NLRB judge says arbitration confidentiality pacts are illegal", Daniel Wiessner, Reuters, March 26, 2019