238
Opinion of the Court
wrongful discharge and his related contract and tort claims have "merged in the judgment," and he cannot sue again to recover more. See Parklane Hosiery Co. v. Shore, 439 U. S. 322, 326, n. 5 (1979) ("Under the doctrine of res judicata, a judgment on the merits in a prior suit bars a second suit involving the same parties or their privies based on the same cause of action."); see also Restatement (Second) of Judgments § 17 (1980). Similarly, GM cannot sue Elwell elsewhere on the counterclaim GM asserted in Michigan. See id., § 23, Comment a, p. 194 ("A defendant who interposes a counterclaim is, in substance, a plaintiff, as far as the counterclaim is concerned, and the plaintiff is, in substance, a defendant.").
Michigan's judgment, however, cannot reach beyond the Elwell-GM controversy to control proceedings against GM brought in other States, by other parties, asserting claims the merits of which Michigan has not considered. Michigan has no power over those parties, and no basis for commanding them to become intervenors in the Elwell-GM dispute. See Martin v. Wilks, 490 U. S. 755, 761-763 (1989). Most essentially, Michigan lacks authority to control courts elsewhere by precluding them, in actions brought by strangers to the Michigan litigation, from determining for themselves what witnesses are competent to testify and what evidence is relevant and admissible in their search for the truth. See Restatement (Second) of Conflict of Laws §§ 137-139 (1969 and rev. 1988) (forum's own law governs witness competence and grounds for excluding evidence); cf. Société Nationale Industrielle Aérospatiale v. United States Dist. Court for Southern Dist. of Iowa, 482 U. S. 522, 544, n. 29 (1987) (foreign "blocking statute" barring disclosure of certain information "do[es] not deprive an American court of the power to order a party subject to its jurisdiction to produce [the information]"); United States v. First Nat. City Bank, 396 F. 2d 897 (CA2 1968) (New York bank may not refuse to produce records of its German branch, even though doing so might subject the bank to civil liability under German law).
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