In Auto Workers v. Hoosier Cardinal Corp., 383 U.S. 696, 86 S.Ct. 1107, 16 L.Ed.2d 192 (1966), the Court considered an action brought by a union against an employer to recover vacation pay that allegedly was due to discharged employees under the terms of a collective bargaining agreement. Because an action for vacation pay is basically an action for damages based on an employer's alleged breach of a collective bargaining agreement, which closely resembles a state law action for contractual breach, id. at 705 n. 7, 86 S.Ct. at 1113 n. 7, the Court applied the state's statute of limitations for contracts not in writing, id. at 707, 86 S.Ct. at 1114. The Court made clear, however, that its decision did not necessarily mandate a similar result in other section 301 actions, id. at 705 n. 7, 86 S.Ct. at 1113 n. 7 ("Whether other 301 suits different from the present one might call for the application of other rules on timeliness, we are not required to decide, and we indicate no view whatsoever on that question.")