Nos. 21331, 21484. Argued April 17, 1968. Decided May 1, 1968. Petition for Rehearing Denied June 27, 1968. Mr. Jerry D. Anker, Washington, D.C., with whom Mr. Stephen E. Moss, Washington, D.C., was on the brief, for petitioners in No. 21,331 and intervenors in No. 21,484. Mr. Larry Lesh, Dallas, Tex., of the bar of the Supreme Court of Texas, pro hac vice, by special leave of court, with whom Mr. Warren Woods and Mrs. Betty Southard Murphy, Washington, D.C., were on the brief, for appellant in No