discussed Cited "see, e.g." Knox v. International Union, United Automobile, Aircraft & Agriculture Implement Workers See also Krulikowsky v. Metropolitan District Council of Philadelphia and Vicinity, D.C., 212 F.Supp. 338, 340 , and Lankford v. International Brotherhood of Electrical Workers, D.C., 196 F.Supp. 661 , affirmed 5 Cir., 293 F.2d 928 , cert. den. 368 U.S. 1004 , 82 S.Ct. 625 , 7 L.Ed.2d 543 .