dissenting.
The resolution of the issue before the Court in this case necessitates setting out the history of this litigation in more detail than does the Court. Petitioner originally brought his action against the employer in an Alabama court in a three-count complaint, the first count relying on Alabama’s Workmen’s Compensation Act and the other two on Alabama common law. He then voluntarily dismissed these counts and reinstituted the action in the Alabama court with sole and express reliance on the Georgia Workmen’s Compensation Act. A default judgment was then entered in petitioner’s favor on the basis of this new complaint. No appeal was taken from this default judgment.
*44Petitioner then filed a complaint in an Alabama court against respondent, the employer’s insurance company, to enforce the previously obtained default judgment. Respondent asserted in defense that, since the Georgia Act upon which the action was based provides for primary jurisdiction in an administrative board and precludes original court jurisdiction, the Alabama court lacked subject matter jurisdiction to enter the default judgment. The default judgment, therefore, respondent contended, was void and could be collaterally attacked in the enforcement proceeding. Petitioner’s demurrer to this defense was overruled by the Alabama court. Following this, petitioner voluntarily dismissed the action in the Alabama court and the next day filed the diversity suit here before us, identical to the previous Alabama action. Respondent again asserted the defense of lack of subject matter jurisdiction to enter the default judgment. Based on this defense, and after the submission of briefs and oral argument, Judge Grooms dismissed the complaint. In holding that there had not been subject matter jurisdiction to enter the default judgment, Judge Grooms relied on Green v. J. A. Jones Construct. Co., 161 F. 2d 359, a decision of the Fifth Circuit. 224 F. Supp. 87, 88. He then went on to hold, relying on Alabama cases, that since there had been no subject matter jurisdiction in the original action, the default judgment was, under Alabama law, subject to collateral attack. The Court of Appeals affirmed per curiam on the basis of its prior decision in Green v. J. A. Jones Construct. Co., supra. 324 F. 2d 499.
This case does not present the issue of whether Alabama could have applied its own compensation act or its own common law. Respondent concedes that, on the facts of this case,1 it could have applied either and our *45decisions plainly so hold. See Pacific Employers Ins. Co. v. Commission, 306 U. S. 493; Carroll v. Lanza, 349 U. S. 408. But, as I have already noted, petitioner, who originally sued under both Alabama’s Workmen’s Compensation Act and common law, dismissed those counts and based his action solely on the Georgia Workmen’s Compensation Act. The federal issue raised by respondent is whether, consistently with the Full Faith and Credit Clause, a State may enforce in its courts the liability claims created by another State in violation of that other State’s fixed policy to have those claims enforced only by an administrative board. There is no decision of this Court which settles this federal issue and, in my view, the question is not free from difficulty. See Tennessee Coal Co. v. George, 233 U. S. 354, 359, and cases there cited; but cf. Pearson v. Northeast Airlines, Inc., 309 F. 2d 553 (C. A. 2d Cir.); Kilberg v. Northeast Airlines, Inc., 9 N. Y. 2d 34, 172 N. E. 2d 526.
On the record here presented it seems clear to me that the Court should not reach this constitutional question. In the case before us, if Alabama’s own law independently forbids the piecemeal borrowing of Georgia statutes and denies to the Alabama courts jurisdiction to entertain petitioner’s suit on the Georgia statute, the question of whether the Federal Constitution forbids such piecemeal borrowing need not be reached. The Court recognizes, ante, at 42-43, that this issue is in the case, but bypasses this threshold state law issue and reaches the ultimate federal constitutional problem. In so doing, the Court disregards the long-settled rule that this Court will not pass upon federal constitutional questions if there are state law grounds presented upon which the case may be disposed of. See Siler v. Louisville & Nashville R. Co., 213 U. S. 175; Ashwander v. Valley Authority, 297 U. S. 288, 347 (Brandeis, J., concurring), and cases there cited.
*46The sole basis for the Court’s inversion of this long-settled rule of reaching state law issues before constitutional ones, is that it reads the decisions below as based upon “supposed constitutional compulsion,” ante, at 43, and not upon independent state law. I believe that the lower courts did rest their decisions upon independent state law and that they determined that the default judgment was void under Alabama law.
The opinion of Judge Grooms, an experienced Alabama lawyer, makes it clear that he relied upon Alabama law in deciding that the original default judgment could be collaterally attacked.2 The Court apparently does not dispute this. It, however, reads the opinions below as relying upon federal and not upon independent state law for the determination that the Alabama court was without subject matter jurisdiction to enter the default judgment. In reaching this conclusion, the Court relies upon the fact that both Judge Grooms and the Court of Appeals cited as controlling the Fifth Circuit’s prior decision in Green v. J. A. Jones Construct. Co., supra. Ante, at 40. The Court then reads Green as resting upon full faith and credit compulsion. A careful reading of Green, however, discloses that it did not rest on constitutional grounds.
The Court of Appeals in Green had affirmed the dismissal by the United States District Court in Mississippi of a diversity action based upon the same Georgia statute *47which is involved in this case. The Green court stated its conclusion that “it is quite clear that the case is ruled by the principle that where the provision for the liability claimed is coupled with a provision for a special remedy to be afforded not by a court but by a commission, that remedy and that alone must be employed and resort to court action may not be had for relief.” Id., at 359. As authority for this “principle” the court cited the Restatement of the Law, Conflict of Laws, § 618, Comment a, an Arkansas and a Missouri case, both resting on state law, and two federal court diversity cases, clearly applying state law.3
While the language of this general principle stated by the Green court is similar to that of Tennessee Coal Co. v. George, supra, at 359, quoted in the Court’s opinion, ante, at 43, there is no indication whatsoever that this general state law principle was conceived to be based on federal compulsion emanating from the dictum in the George case. Nowhere in the Green opinion is there any mention of the Full Faith and Credit Clause, the George case, or, indeed, any federal law. Moreover, the authorities cited by the Green court for this general principle similarly do not rest on any concept of federal compulsion. The Restatement’s position is not conceived to be based on full faith and credit grounds.4 Neither of the federal court cases cited has any reference at all to any federal law, including the George case. The same is true of the Missouri case cited, and the Arkansas case cited only *48refers to the George case for a different point in the George case. Finally, the text writers are in accord with these authorities in not basing the general state law principle on the Full Faith and Credit Clause.5
The Green case is not a case like those in which the opinion as a whole “leaves the impression that the court probably felt constrained to rule as it did because of [decisions of this Court],” Minnesota v. National Tea Co., 309 U. S. 551, 554-555, or “because it felt under compulsion of federal law as enunciated by this Court so to hold,” Missouri v. Mayfield, 340 U. S. 1, 5. See Jankovich v. Indiana Toll Road Comm’n, 379 U. S. 487, 492.
Thus the Green court clearly seems to have decided the case not on full faith and credit principles, but on the assumption that Mississippi law was in accord with the general independent state law rule.6 When Judge Grooms and the Court of Appeals in the instant case, referred to Green, they were not therefore, referring to it as stating constitutional compulsion, but as stating the general state law rule to which both Mississippi and Alabama adhere. Again, as in Green there is nothing in either opinion below that might be taken as even a remote reference to the Full Faith and Credit Clause or any other federal rule or authority. I would not presume that the lower federal courts, particularly in a diversity case, would, in light of the settled decisions of this Court, decide a case by determining constitutional issues without first deciding threshold issues of state law. See Alma Motor *49Co. v. Timken Co., 329 U. S. 129,136-137. It seems clear to me, therefore, that the dismissal of petitioner’s action was based on independent state law and not on federal grounds.
Even if I am wrong on this point, however, and the Court is correct in assuming that the lower courts here did not rule on the question of independent state law, this would not justify the Court’s ignoring the fact that the decision below is clearly supported by independent state law and, as a consequence, the constitutional issue should not be reached and decided. Cf. Neese v. Southern R. Co., 350 U. S. 77.
In Singleton v. Hope Engineering Co., 223 Ala. 538, 540, 137 So. 441, 442-443, the Alabama Supreme Court held that the Alabama courts do not have subject matter jurisdiction to enforce the identical Georgia Workmen’s Compensation Act here in issue, on the grounds that the enforcement of the Georgia Act is vested exclusively in the Georgia Workmen’s Compensation Commission. In reaching this conclusion of state law the Alabama Supreme Court did not cite the Full Faith and Credit Clause, Tennessee Coal Co. v. George, supra, or indeed any federal authority whatsoever. While Singleton arose on direct appeal, this fact is not significant. In the instant case, Judge Grooms expressly held that where the court that entered the default judgment lacked subject matter jurisdiction of the controversy, Alabama law permits collateral attack on the validity of the default judgment.7 As noted above, Singleton is in accord with the general state rule on this point and there is no claim that its vitality as a precedent has been impaired in any *50way.8 Finally, while it is true that the Alabama enforcement action was dismissed without prejudice, the Alabama court in that case, in overruling the demurrer to this asserted defense, necessarily held that under Alabama law the default judgment was subject to collateral attack as it was entered by a court that lacked subject matter jurisdiction of the controversy. For these reasons I believe the decision below is clearly supported by independent Alabama law.
Certiorari was granted in this case on the assumption that it necessitated deciding the constitutional issue involving the Full Faith and Credit Clause. Since, in my view, it is unnecessary and improper to teach that issue in this case, I would dismiss the writ as improvidently granted.
But even if my analysis of the decisions below is erroneous and the Alabama law is not as clear as I conceive it to be, I would still not agree that it is appropriate to determine the ultimate constitutional issue. There is no doubt, as even the Court recognizes, that there exists here at least a lurking question of independent state law. Under such circumstances, the least that should be done is to vacate the judgment below and remand the case to the District Court for clarification of its opinion as to the status of Alabama law. Cf. Alma Motor Co. v. Timken Co., supra.
For these reasons, I respectfully dissent from the Court’s disposition of this case.
As the Court points out, ante, at 39, 40, petitioner was an Alabama resident, and was injured while working in Alabama.
Judge Grooms stated, 224 F. Supp., at 88:
“Since the DeKalb County Circuit Court did not have jurisdiction of the subject matter, the issue of jurisdiction is open to inquiry and where, as here, the record discloses a lack of jurisdiction, the judgment is void. City of Birmingham v. Reed, 35 Ala. App. 31, 44 So. 2d 607; Murphy v. Louisville & N. R. Co., 258 Ala. 138, 61 So. 2d 3; Crump v. Knight, 256 Ala. 601, 56 So. 2d 625; Freeman v. McBroom, 11 Ala. 943.
“A party or his privies may assail such a judgment. Fife v. Pioneer Lumber Co., 237 Ala. 92, 185 So. 759; Cobbs v. Norville, 227 Ala. 621, 151 So. 576.”
The cases cited at 359, n. 2, were: Elliott v. De Soto Crude Oil Purchasing Corp., 20 F. Supp. 743; Franzen v. E. I. Du Pont De Nemours & Co., 146 F. 2d 837; Logan v. Missouri Valley Bridge & Iron Co., 157 Ark. 528, 249 S. W. 21; and Oren v. Swift & Co., 330 Mo. 869, 51 S. W. 2d 59.
This is clear when § 618, Comment a, is read in conjunction with §§ 1, 2, and 5 and the Comments thereto. In this regard, §§ 1171 and 117m of Restatement Second, Conflict of Laws, Tentative Draft No. 4 (1957), should also be compared.
See 2 Larson, Workmen’s Compensation Law 356 (1961); Goodrich, Conflict of Laws 189 (1964); Ehrenzweig, Conflict of Laws 145, nn. 23, 32 (1962).
In addition to the cases cited in note 2, supra, and Singleton v. Hope Engineering Co., 223 Ala. 538, 137 So. 441, discussed infra, see Mosely v. Empire Gas & Fuel Co., 313 Mo. 225, 281 S. W. 762; Davis v. Swift & Co., 175 Tenn. 210, 133 S. W. 2d 483; Grenier v. Alta Crest Farms, Inc., 115 Vt. 324, 58 A. 2d 884.
See note 2, supra. It should be noted that the cases cited by Judge Grooms all concerned situations where the lack of subject matter jurisdiction was a matter of state law similar to the Singleton situation.
It is significant in this regard that the tentative draft of the Second Restatement of the Law of Conflict of Laws reaffirms this general rule. See Restatement Second, Conflict of Laws, Tentative Draft No. 4, § 117m (1957).