The NLRB has ruled that Graymont PA, Inc. has violated the NLRA in making unilateral contract changes and in withholding information from its employees, who are represented by Local Lodge D92 of the United Cement, Lime, Gypsum and Allied Workers. Graymont PA, Inc. is a lime-mining company that produces lime products in the U.S. and Canada, including its several locations in Pennsylvania, where the NLRA ruled that the company violated Section 8(a)(5) and 8(a)(1) of the NLRA. The Board overruled precedent set forth in Raley's Supermarkets & Drug Centers (2007) to state that a company’s refusal to furnish information regarding unilaterally-changed workplace rules and regulations to its employees constitutes an unfair labor practice.
See "NLRB Rules Employer Should Have Disclosed Lack of Information", Lawrence E. Dubé, Bloomberg BNA, July 1, 2016