“ This calls for an appropriate order vacating the proceedings in this Court and in the District Court for the Southern District of California as well as the deportation proceedings which derived from a finding that the appellee has lost his citizenship by reason of § 401 (j) of the Nationality Act, a conclusion which is the very issue in controversy. I would do so without summarizing the positions of the parties on the claim of collateral estoppel which is not relevantly before us on this record, and, above all, without any intimation regarding the seriousness of such a claim. ”

“ The issue of collateral estoppel is a question that clouds the underlying issue of constitutionality. Since the issue of collateral estoppel may be dispositive of the case, we remand the cause to the District Court with permission to the parties to amend the pleadings, if they so desire, to put in issue the question of collateral estoppel and to obtain an adjudication upon it. ”

“ Appellee contends that while that Act requires service of aliens residing here, it is inapplicable to nonresident aliens; and that therefore the charge in the indictment that appellee remained away could be applicable only if appellee were a citizen. ”