Pursuant to a grand jury subpoena, petitioner appeared before the September 1971 Grand Jury in the Northern District of Illinois on September 23 and 28, 1971. The Grand Jury was investigating possible violations of the conspiracy provision of the Criminal Code (18 U.S.C. § 371) and оf the provision proscribing thefts of interstate shipments (18 U.S.C. § 659). The Government advised petitioner that he was a potential defendant in that investigation. On both occasions, he was directed by the foreman of the Grand Jury to furnish handwriting and printing exemplars to its designated agent, but he refused to do so on constitutional grounds. After considering the Government’s petition for a court order directing Mara to furnish such exemplars of his handwriting and printing as the Grand Jury deemed necessary, and after considering in camera an аffidavit of FBI Special Agent William L. Buchanan, the district court ordered Mara to furnish the exemplars to the Grand Jury, obviously agreeing with the United States Attorney that this was “essential and necessary” to the Grand Jury’s investigation in order to determine whether pеtitioner was “the author of certain writings.” Later that day Mara refused to obey the court’s order and was therefore adjudged in contempt and committed to the custody of the United States Marshal for the Northern District of Illinois “until such time as said resрondent shall obey said order.”
On appeal, petitioner’s principal argument is that the order directing him to furnish the exemplars constituted an unreasonable search and seizure within the meaning of the Fourth Amendment.
1
2Under our opinion in In re Dionisio,
To show reasonableness, the Government submitted the aforementioned affidavit of Agent Buchanan in camera to the district court. The affidavit was then impounded without being shown to petitioner or his counsel. Petitioner challenges the adequacy of this secretive, ex parte procedure as nullifying his Fourth Amendment rights and deficient under the due process clause of the Fifth Amendment.
In our view, to justify the reasonablеness of a request to furnish handwriting and printing exemplars to the Grand Jury, the Government must show reasonableness by presenting its affidavit in open court in order that petitioner may contest its sufficiency. Cf. United States v. Roth,
It is true, of course, that arrest or search warrants normally issue from an
ex parte
proceeding in which a “neutral and detached” magistrate is the only initial buffer between government and citizen. Aguilar v. Texas,
More important, unlike the warrant situation where the accused will have an opportunity to contest the sufficiency of the warrant on a motion to suppress before he may be tried and imprisoned (Federal Rules of Criminal Procedure 41(e); Giordenello v. United States,
The Government argues that the hearing on its petition to enforce the grand jury’s direction must be
ex parte
rather than adversary in nature in order to protect the secrecy of grand jury proceedings. By now it should be apparent that “grand jury secrecy” is no magical incantation making everything connected with the grand jury’s investigation somehow untouchable. Dennis v. United States,
supra,
We have examined the affidavit and find that ,it does not recount proceedings before the grand jury. Rather, it states the results the Government derived from its own investigation and then presented to the grand jury. Thus disclosure herе cannot be said to discourage the grand jurors from engaging in uninhibited investigation, full discussion, and conscientious voting. Since he is re
*584
questing the disclosure, certainly Mara could not be heard to object that the affidavit might reveal disparaging information about him. Moreover, he has been advised that he is a potential defendant so that the Government cannot convincingly contend that divulging the material in the affidavit would precipitate his flight from prosecution. In any case, the Governmеnt is well aware of the means at its disposal to prevent escape.
4
Finally, the affidavit does not appear to contain information elicited from complainants and witnesses before the grand jury. Where anonymity is necessary to prevent intimidation or preserve sources of information, deletion of the witnesses’ identity may be permitted under the proper standards of trustworthiness and reliability. See Jones v. United States,
Disclosure of the affidavit in open court is particularly appropriate where, as here, the information contained therein is the fruit of the Government’s own investigatory activity and does not bear the imprint of the grand jury’s independent initiative. Such disclosure should serve to curtail any attemрt to circumvent the requirements of the Fourth Amendment by interposing the grand jury between it and the citizen under investigation. In re Dionisio,
supra,
The Government sometimes may be unable to carry its burden of showing reasonableness in open court without jeopardizing thе values that grand jury secrecy is meant to protect. In such rare instances, the Government may properly approach the court to preserve the confidentiality of those portions of the affidavit which ought not be exposed. We are confident that in deciding what matters may be withheld, the district court will be guided not by a blind obeisance to grand jury secrecy but solely by the purposes which are truly served by this privilege. Dennis v. United States,
supra,
The substantive showing that the Government must make tо justify the order it seeks is that the grand jury’s direction to furnish exemplars is “reasonable.” In re Dionisio,
supra,
As the Court indicated in
Dionisio,
it would be an abuse of the grand jury process for the Government to conduct a general fishing expedition under grand jury sponsorship with the mere explanation that the witnesses are potential defendants.
In addition, we hold it to be an abuse of the grand jury process for the Government to impose on that body to perform investigative work that cаn be, and heretofore has been, successfully accomplished by the regular investigative agencies of Government. Therefore, the Government’s affidavit must also show why satisfactory handwriting and printing exemplars cannot be obtained from оther sources without grand jury compulsion.
In accordance with a suggestion in the Government’s brief in the
Dionisio
case,
supra,
if the Government makes an adequate showing of reasonableness for the compulsion of these exemplars, they should be furnished in the grand jury room as part of its process if petitioner prefers that course in lieu of furnishing them to the FBI in the presence of his counsel (in accordance with the option extended him by the Government). See In re Dionisio,
supra,
Without an open and sufficiently stringеnt test of reasonableness to support the order compelling the furnishing of the exemplars, petitioner’s incarceration was unjustified. Therefore, the contempt judgment is reversed, and the cause is remanded for further proceеdings consistent herewith. Our mandate will issue forthwith.
Notes
. Although petitioner also relies on the Fifth and Sixth Amendments, comparable arguments were rejected in In re Dio-nisio,
. See also United States v. Bailey,
. Since a warrant was not involved, this seizure is to be tested by reasonableness rather than by рrobable cause. In re Dionisio, supra at 280.
. If the Government has probable cause to believe that disclosure of its affidavit in an adversary proceeding will precipitate the disappearance of the witness, it may procure a material witness arrest warrant. See Bacon v. People of State of California,
. Although the Supreme Court remarked that it “has insisted upon probable cause as a minimum requirement for a reasonable search permitted by the Constitution,” Chаmbers v. Maroney,
