opinion: Per Curiam.
  Trial of this case should have been before a three-judge District Court convened pursuant to 28 U. S. C. §§ 2282, 2284, as petitioner requested. Her complaint explicitly-sought an -“injunction restraining the enforcement, operation or execution of . . . [an] Act of Congress” — § 352 (a)(1) of the Immigration and Nationality Act of 1952, 8 U. S. C. § 1484 (a)(1), which provides that a naturalized American citizen shall lose his nationality by “having a continuous residence for three years in the territory of a foreign state of which he was formerly a national or in which the place of his birth is situated . . . .” The District Court concluded that petitioner’s complaint presented no substantial constitutional issue and denied petitioner’s motion to convene a three-judge court, relying on Lapides v. Clark, 85 U. S. App. D. C. 101, 176 F. 2d 619 (1949), cert. denied, 338 U. S. 860, in which the Court of Appeals for the District of Columbia Circuit had directly upheld the predecessor of a companion provision, § 352 (a)(2) of the 1952 Act, 8 U. S. C. § 1484 (a)(2), which deprived the naturalized American of his citizenship for residing for five years in any foreign state. The Court of Appeals’ per curiam affirmance was also based on Lapides. Although no view is here intimated as to the merits of the constitutional question in the present case, we disagree with the conclusion of the courts below as to the substan-tiality of that issue. The intervening decisions of this Court in Perez v. Brownell, 356 U. S. 44, and Trop v. Dulles, 356 U. S. 86, reveal that the constitutional questions involving deprivation of nationality which were presented to the district judge were not plainly insubstantial. The single-judge District Court was therefore powerless to dismiss the action on the merits, and should have convened a three-judge court. Ex parte Northern Pac. B. Co., 280 U. S. 142, 144; Stratton v. St. Louis S. W. R. Co., 282 U. S. 10, 15; Ex parte Poresky, 290 U. S. 30; Idlewild Bon Voyage Liquor Corp. v. Epstein, 370 U. S. 713. The judgments below are vacated and the case is remanded to the District Court for expeditious action consistent with the views here expressed.
  So ordered.
choices: voting Voting Rights Act of 1965, plus amendments ballot access (of candidates and political parties) desegregation (other than as pertains to school desegregation, employment discrimination, and affirmative action) desegregation, schools employment discrimination: on basis of race, age, religion, illegitimacy, national origin, or working conditions. affirmative action slavery or indenture sit-in demonstrations (protests against racial discrimination in places of public accommodation) reapportionment: other than plans governed by the Voting Rights Act debtors' rights deportation (cf. immigration and naturalization) employability of aliens (cf. immigration and naturalization) sex discrimination (excluding sex discrimination in employment) sex discrimination in employment (cf. sex discrimination) Indians (other than pertains to state jurisdiction over) Indians, state jurisdiction over juveniles (cf. rights of illegitimates) poverty law, constitutional poverty law, statutory: welfare benefits, typically under some Social Security Act provision. illegitimates, rights of (cf. juveniles): typically inheritance and survivor's benefits, and paternity suits handicapped, rights of: under Rehabilitation, Americans with Disabilities Act, and related statutes residency requirements: durational, plus discrimination against nonresidents military: draftee, or person subject to induction military: active duty military: veteran immigration and naturalization: permanent residence immigration and naturalization: citizenship immigration and naturalization: loss of citizenship, denaturalization immigration and naturalization: access to public education immigration and naturalization: welfare benefits immigration and naturalization: miscellaneous indigents: appointment of counsel (cf. right to counsel) indigents: inadequate representation by counsel (cf. right to counsel) indigents: payment of fine indigents: costs or filing fees indigents: U.S. Supreme Court docketing fee indigents: transcript indigents: assistance of psychiatrist indigents: miscellaneous liability, civil rights acts (cf. liability, governmental and liability, nongovernmental; cruel and unusual punishment, non-death penalty) miscellaneous civil rights (cf. comity: civil rights)