Nos. 389-391, Docket 27544, 27550, 27560. Argued June 14, 1962. Decided July 31, 1962. Roman Beck of Krisel, Beck Taylor, New York City (Arthur Karger, New York City, of counsel, on the brief), for petitioners Harbor Carriers of the Port of New York. Christopher E. Heckman of Foley Martin, New York City (James S. Reardon, New York City, of counsel, on the brief), for petitioners Gallagher Bros. Sand Gravel Corp., Bilkay Holding Corp., Hampton Scows, Inc., Neptune Line, Inc., and Rockville Scows,