International Union, United Mine Workers of America v. National Labor Relations Board

Upon charges of certain companies operating “captive” bituminous coal mines, respondent Board found as an unfair labor practice that petitioners, without complying with the statutory authorization procedure 1 and in violation of Section 8(b) (2) of the Labor Management Relations Act, 1947, 2 attempted to cause and did cause said companies to execute an agreement containing an invalid union-shop provision, resulting in discrimination against said companies’ employees within the meaning of Section 8(a) (3) of the Act, and in so doing did resort to strike action to support their demand.…