PPG INDUSTRIES, INC., LEXINGTON PLANT, FIBER GLASS DIVISION, PETITIONER v. NATIONAL LABOR RELATIONS BOARD, RESPONDENT, TEAMSTERS LOCAL UNION NO. 391, INTERVENOR. No. 81-1329.United States Court of Appeals, Fourth Circuit.Argued November 4, 1981. Decided February 16, 1982. Rehearing and Rehearing En Banc Denied April 26, 1982. Page 818 Richard C. Hotvedt, Washington, D.C. (Susan S. Sauntry, […]