7, 1373 (6 Cir.1992) (holding that the existence of pen- dent state claim did not relieve the Court of its obligation to apply the federal law of Tivilege); Wm. 7'. Thompson Co. Gen. Nutrition Corp., 671 F.2 100, 104 (3d Cir.1982) (holding "that when there are federal law claims in a case also pr