for union activities unrelated to the union’s duties as the bargaining representative and to obtain a reduction in dues and fees of such activities. California Saw & Knife Works, 320 NLRB 224, 233 (1995), enfd. sub nom. Machinists v. NLRB, 133 F.3d 1012 (7th Cir. 1998), cert. denied sub nom. Strang v. NLRB, 525 U.S. 813 (1998