International Union of Mine Mill and Smelter Workers Locals No. 15 v. Eagle-Picher Mining & Smelting Company

Mr. Louis N. Wolf, of Joplin, Mo., for petitioners.

Mr. Alvin J. Rockwell, of Washington, D.C., for respondent, National Labor Relations Board.

Mr. John G. Madden, of Kansas City, Mo., for respondents Eagle-Picher Mining & Smelting Co. et al.

Mr. Justice ROBERTS delivered the opinion of the Court.