Butte, Anaconda & Pacific Railway Company, a Corporation, Appellant, v. Brotherhood of Locomotive Firemen and Enginemen, a Voluntary Labor Association; Frank W. Glass, Individually and As Vice President of the Brotherhood of Locomotive Firemen and Enginemen; J. H. Mccarvel, Individually and As General Chairman of the Brotherhood of Locomotive Firemen and Enginemen; Brotherhood of Railroad Trainmen, a Voluntary Labor Association; H. E. Nevala, Individually and As Deputy President of the Brotherhood of Railroad Trainmen; and R. R. Mclean, Individually and As General Chairman of the Brotherhood of Railroad Trainmen, Appellees