CERTIORARI TO THE UNITED STATES COURT OF APPEALS FOR THE DISTRICT OF COLUMBIA CIRCUIT. No. 18. Argued October 10, 1951. Decided November 26, 1951. 1. The procedure prescribed by § 338 of the Nationality Act of 1940, 8 U.S.C. § 738, is the exclusive procedure for revoking naturalization on the ground of fraud or illegal procurement, based on evidence outside the record. Pp. 77-88. 2. A state court granted petitioner a certificate of citizenship. At the same term, as permitted by state practice, it