Nos. 282-285, Dockets 31910-31913. Argued February 19, 1968. Decided May 13, 1968. Godfrey P. Schmidt, New York City, for petitioners. Michael N. Sohn, Washington, D.C. (Arnold Ordman, General Counsel, Dominick Manoli, Associate General Counsel, Marcel Mallet-Prevost, Asst. General Counsel, Gregory L. Hellrung, Washington, D.C., Attorney), for respondent. Henry Kaiser, Ronald Rosenberg, George B. Driesen, Washington, D.C., Emanuel Dannett, Jacob Silverman, New York City, for intervenor. Before FRIENDLY