The petitions for writs of certiorari are granted, except that in No. 84 the writ is granted as to petitioner Franzese only and denied as to the other petitioners, and in No. 317 the petition is granted as to petitioners Mirro and McDonnell only and denied as to the other petitioners. † The judgments of the Courts of Appeals in these cases are vacated, and the cases remanded to the respective District Courts for further proceedings in conformity with Alderman v. United States, Ivanov v. United States, and Butenko v. United States, ante, p. 165. It is not evident from the records in some of these cases whether the surveillances at issue were unlawful. It may be that the overhearings in some instances were not achieved by trespass, see Katz v. United States, 389 U. S. 347 (1967); Desist v. United States, ante, p. 244, and Kaiser v. New York, ante, p. 280, or for some other reasons were not unlawful. As we held in Alderman, Ivanov, and Butenko, ante, at 170, n. 3, “the District Court must develop the relevant facts and decide if the Government’s electronic surveil*313lance was unlawful.” Of course, a finding by the District Court that the surveillance was lawful would make disclosure and further proceedings unnecessary. Similarly, it is not clear that each petitioner has standing to assert the illegality of the surveillance or of the introduction of its fruits. As in Alderman, Ivanov, and Butenko, these issues are to be resolved by the District Courts in the first instance.

concurring.

A few words in amplification of this per curiam opinion may help to avoid misunderstanding on the part of the litigants, and of the District Courts to which these cases are remanded.

As we made explicit in Alderman, Butenko, and Ivanov, the requirement that certain products of governmental electronic surveillance be turned over to defense counsel was expressly limited to situations where the surveillance had violated the Fourth Amendment. We did not decide in those cases, and we do not decide in these, that any of the surveillances did violate the Fourth Amendment.1 *314Instead, we have left that threshold question for the District Courts to decide in all these cases.

Moreover, we did not in Alderman, Butenko, or Ivanov, and we do not today, specify the procedure that the District Courts are to follow in making this preliminary determination. We have nowhere indicated that this determination cannot appropriately be made in ex parte, in camera proceedings. “Nothing in Alderman v. United States, Ivanov v. United States, or Butenko v. United States, ante, p. 165, requires an adversary proceeding and full disclosure for resolution of every issue raised by an electronic surveillance.” Taglianetti v. United States, post, p. 316.

Finally, the Court has not in any of these cases addressed itself to the standards governing the constitutionality of electronic surveillance relating to the gathering of foreign intelligence information — necessary for the conduct of international affairs, and for the protection of national defense secrets and installations from foreign espionage and sabotage. Mr. Justice White *315has elsewhere made clear his view that such surveillance does not violate the Fourth Amendment, “if the President of the United States or his chief legal officer, the Attorney General, has considered the requirements of national security and authorized electronic surveillance as reasonable.” 2 While two members of the Court have indicated disagreement with that view,3 the issue remains open.4

One might suppose that all of this should be entirely clear to any careful reader of the Court’s opinion in Alderman, Butenko, and Ivanov. Perhaps so, and perhaps, therefore, what I have said is quite unnecessary. But 10 years of experience here have taught me that the most carefully written opinions are not always carefully read — even by those most directly concerned.