Nos. 72-1415, 72-1538. Argued February 21, 1973. Decided July 17, 1973. Francis F. Sulley, Gilbert A. Cornfield, Chicago, Ill., for petitioners. Peter G. Nash, Gen. Counsel, Jay E. Shanklin, Atty., N.L.R.B., Washington, D.C., for respondent. Petition for review from the National Labor Relations Board. Before STEVENS, Circuit Judge, GRANT, Senior District Judge, and GORDON, District Judge. Senior District Judge Robert A. Grant of the Northern District of Indiana is sitting by designation. District