Labor disputes. Labor disputes and unfair labor practices, opinions of Supreme Court in cases of Edward Lauf and Amalgamated Meat Cutters and Butcher Workmen of North America, Local No. 73 vs. E. G. Shinner & Co., Inc.; National Labor Relations Board vs. Pennsylvania Greyhound Lines, Inc., and Greyhound Management Company; and [same] vs. Pacific Greyhound Lines, Inc., relative to labor disputes and unfair labor practices; presented by Mr. Wagner.