Nos. 73-1231, 73-1501. Argued March 7, 1974. Decided May 7, 1974. Bernard Dunau, Washington, D.C., with whom Plato E. Papps, Washington, D.C., was on the brief, for petitioner in No. 73-1231 and intervenor in No. 73-1501. Leo P. Rock, Jr., Tampa, Fla., for petitioner in No. 73-1501 and intervenor in No. 73-1231. Joseph C. Thackery, Atty., N.L.R.B., with whom John S. Irving, Deputy Gen. Counsel, Patrick Hardin, Associate Gen. Counsel, Elliott Moore, Asst. Gen. Counsel, and Robert Sewell, Atty., N