Circa 2015
NLRB: USPS managers could be disciplined who fail to supply relevant information to Unions"...(b) Refusing to bargain collectively and in good faith with the National Postal Mail Handlers Union, Local 317, by failing, refusing, and unduly delaying in furnishing information that is relevant and necessary to the performance of their duties as agents of the National Postal Mail Handlers Union..."
Reference: www.postal-reporter.com