Is there any case law where federal or state courts have jurisdiction to hear a class action in a class A class B class action?

[T]he cases reflect a balanced inquiry into such factors as the nature of the federal and state interests in regulation and the potential for interference with federal regulation. As we said in Vaca v. Sipes, 386 U.S. at 180 [87 S.Ct. 903 at 911, 17 L.Ed.2d 842] [1967], our cases "demonstrate that the decision to pre-empt federal and state court jurisdiction over a given class of cases must depend upon the nature of the particular interests being asserted and the effect upon the administration of national labor policies of concurrent judicial and administrative remedies."