Whether a defendant that was neither a party nor in privity with a party to the earlier proceeding may invoke res judicata against a party who was bound by that proceeding.
Holding
Yes. A defendant may assert issue preclusion even though it was not a party or privy to the earlier action; mutuality of estoppel is not required.
Reasoning
Res judicata serves the public policy of ending litigation after a party has received a fair opportunity to litigate an issue. It prevents a litigant from repeatedly putting the same resolved question into controversy and protects others from repeated suits arising from that question.
Due process limits who may be bound by a prior judgment: a person cannot lose rights through litigation without notice and an opportunity to be heard. Thus, preclusion may be asserted only against a person who was a party to the earlier litigation or in privity with a party.
Those due-process concerns do not require that the person invoking preclusion also have been a party or privy to the prior action. The Court found no persuasive justification for a mutuality rule that would prevent a litigant bound by an earlier decision from relying on it merely because the new opponent was not bound had the result gone the other way.
The Court noted that courts already recognized an exception where the later defendant’s liability depends on the liability of someone exonerated in the prior suit, such as in master-servant or principal-agent cases. Those cases reflect the broader principle that a plaintiff who has already had a day in court on an identical issue should not be allowed to relitigate it simply by changing adversaries.
The Court therefore stated three controlling questions for a res judicata plea: whether the issue is identical to one decided earlier, whether the earlier decision was a final judgment on the merits, and whether the party against whom preclusion is asserted was a party or privy to the earlier action. Earlier California decisions inconsistent with that rule were overruled.