FLOYD R. GIBSON, Senior Circuit Judge.
In case number 91-2164EM, the Department of Justice (DOJ) appeals the district court’s1 order that it produce a Vaughn2 index to describe records requested by Barbara Ann Crancer (Crancer) pursuant to the Freedom of Information Act (FOIA), 5 U.S.C. § 552 (1988).3 In case number 91-2080, the DOJ alternatively seeks a writ of mandamus prohibiting the district court from ordering production of the Vaughn index. We dismiss the interlocutory appeal and deny the application for a writ of mandamus.
I. BACKGROUND
Jimmy Hoffa, the former president of the International Brotherhood of Teamsters, disappeared in Michigan in July 1975. The FBI began and, apparently, is still conducting, an investigation into Hoffa’s disappearance. As a result of these investigative efforts, the FBI has accumulated over 13,800 pages of records relating to this matter.
In February 1987, Crancer, who is Hoffa’s daughter, filed an FOIA request with the DOJ, seeking materials about an individual who allegedly gave information about Hoffa’s disappearance to the FBI. Crancer’s request was denied on the basis of Exemption 7(A) of the FOIA, which exempts from disclosure “records or information compiled for law enforcement purposes, but only to the extent that the production of such law enforcement records or information ... could reasonably be expected to interfere with enforcement proceedings.” 5 U.S.C. § 552(b)(7)(A).
In February 1989, after all administrative appeals were denied, Crancer filed suit in district court to obtain an order compelling the DOJ to provide her with the documents she requested. While that suit was pending, Crancer submitted a second information request that sought any and all documents relating to the FBI’s investigation into Hoffa’s disappearance. After this request was denied, Crancer amended her lawsuit to include the broader request.
In June 1990, the DOJ moved for summary judgment; one month later, the district court ordered the DOJ to provide Crancer with a Vaughn index within thirty days for her to use in opposing the summary judgment motion. The DOJ moved for reconsideration; the district court refused to rescind its order but did grant the DOJ more time to produce the index. In October 1990, the DOJ asked the district [532]*532court to modify its order and allow the DOJ to provide only the categories of documents contained in the Hoffa file. At the same time, the DOJ submitted a list of nine categories that purported to describe all the documents in the file and an affidavit that described the potential harm to enforcement activities if these categories of documents were released.
The district court denied this request in January of 1991 and gave the DOJ twenty days to prepare a full index and submit it to a magistrate judge for in camera review. One month later, the DOJ asked the magistrate judge for alternate relief and proposed to allow the magistrate judge to review the actual documents in camera. In March, the magistrate judge denied this request, but afforded the DOJ more time to prepare the index; the index was to be completed in one year, with 25% of the index to be submitted to the court every three months. On April 4, 1991, the DOJ asked the district court to reconsider the magistrate judge’s order or, in the alternative, certify the matter for interlocutory appeal. The district court denied these motions two weeks later, and the matter has now been brought to this court.
II. DISCUSSION
A. Jurisdiction
We must begin by deciding whether this court has jurisdiction to hear this case, either as an interlocutory appeal or as an action seeking a writ of mandamus. We conclude that the unique characteristics of this case allow us, on this occasion, to decide the issues presented by the DOJ.
Mandamus is an extraordinary remedy that is “available only in those exceptional circumstances amounting to a judicial usurpation of power,” In re Ford Motor Co., 751 F.2d 274, 275 (8th Cir.1984), or “where the district court exceeds ‘the sphere of its discretionary power.’ ” In re Cessna Distrib. Antitrust Litig., 532 F.2d 64, 68 (8th Cir.1976) (quoting Will v. United States, 389 U.S. 90, 104, 88 S.Ct. 269, 278, 19 L.Ed.2d 305 (1967)). “Other factors which bear on the appropriateness of mandamus review include the need to correct error which is likely to recur and to provide guidelines for the resolution of novel and important questions.” Central Microfilm Serv. Corp. v. Basic/Four Corp., 688 F.2d 1206, 1212 (8th Cir.1982), cert. denied, 459 U.S. 1204, 103 S.Ct. 1191, 75 L.Ed.2d 436 (1983).
Crancer contends that it is within the district court’s discretion to order creation of a Vaughn index, and consequently the court did not act outside its jurisdiction in ordering the DOJ to create an index in this case. The DOJ argues that Exemption 7(A) is different from other exemptions due to case law from the Supreme Court, this court, and other courts of appeal that indicates it is never appropriate for a district court to require a Vaughn index when the government agency invokes Exemption 7(A).4
The DOJ’s argument is a novel one and has not been directly addressed by any court. If the DOJ is correct in its contention that the district court lacked authority to order a Vaughn index, then a writ would be the proper remedy. Because the issue of whether the writ is available is intertwined with the merits of this interlocutory matter, we must decide whether the district court had authority to require a Vaughn-type index in these circumstances. Cf. In re Brotherhood of Ry., Airline and S.S. Clerks, 605 F.2d 1073, 1074 (8th Cir.1979) (per curiam) (deciding to reach merits of dispute because “[i]f the District Court was without jurisdiction to issue the ... order, a court of appeals has jurisdiction to dissolve that order by means of a writ of mandamus.”).5
[533]*533B. Use of Vaughn Indices and Exemption 7(A)
This case is unique because it is not a review of a district court’s order that documents be disclosed, nor is it a review of a district court’s decision that documents are exempt from disclosure. This case asks us to determine what a district court may do while deciding whether documents are or are not exempt from disclosure.
The district court has the responsibility to review the applicability of the government’s claimed exemption de novo. 5 U.S.C. § 552(a)(4)(B). This task is difficult because ordinarily a government agency, and not the court, has access to the documents in question.
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FLOYD R. GIBSON, Senior Circuit Judge.
In case number 91-2164EM, the Department of Justice (DOJ) appeals the district court’s1 order that it produce a Vaughn2 index to describe records requested by Barbara Ann Crancer (Crancer) pursuant to the Freedom of Information Act (FOIA), 5 U.S.C. § 552 (1988).3 In case number 91-2080, the DOJ alternatively seeks a writ of mandamus prohibiting the district court from ordering production of the Vaughn index. We dismiss the interlocutory appeal and deny the application for a writ of mandamus.
I. BACKGROUND
Jimmy Hoffa, the former president of the International Brotherhood of Teamsters, disappeared in Michigan in July 1975. The FBI began and, apparently, is still conducting, an investigation into Hoffa’s disappearance. As a result of these investigative efforts, the FBI has accumulated over 13,800 pages of records relating to this matter.
In February 1987, Crancer, who is Hoffa’s daughter, filed an FOIA request with the DOJ, seeking materials about an individual who allegedly gave information about Hoffa’s disappearance to the FBI. Crancer’s request was denied on the basis of Exemption 7(A) of the FOIA, which exempts from disclosure “records or information compiled for law enforcement purposes, but only to the extent that the production of such law enforcement records or information ... could reasonably be expected to interfere with enforcement proceedings.” 5 U.S.C. § 552(b)(7)(A).
In February 1989, after all administrative appeals were denied, Crancer filed suit in district court to obtain an order compelling the DOJ to provide her with the documents she requested. While that suit was pending, Crancer submitted a second information request that sought any and all documents relating to the FBI’s investigation into Hoffa’s disappearance. After this request was denied, Crancer amended her lawsuit to include the broader request.
In June 1990, the DOJ moved for summary judgment; one month later, the district court ordered the DOJ to provide Crancer with a Vaughn index within thirty days for her to use in opposing the summary judgment motion. The DOJ moved for reconsideration; the district court refused to rescind its order but did grant the DOJ more time to produce the index. In October 1990, the DOJ asked the district [532]*532court to modify its order and allow the DOJ to provide only the categories of documents contained in the Hoffa file. At the same time, the DOJ submitted a list of nine categories that purported to describe all the documents in the file and an affidavit that described the potential harm to enforcement activities if these categories of documents were released.
The district court denied this request in January of 1991 and gave the DOJ twenty days to prepare a full index and submit it to a magistrate judge for in camera review. One month later, the DOJ asked the magistrate judge for alternate relief and proposed to allow the magistrate judge to review the actual documents in camera. In March, the magistrate judge denied this request, but afforded the DOJ more time to prepare the index; the index was to be completed in one year, with 25% of the index to be submitted to the court every three months. On April 4, 1991, the DOJ asked the district court to reconsider the magistrate judge’s order or, in the alternative, certify the matter for interlocutory appeal. The district court denied these motions two weeks later, and the matter has now been brought to this court.
II. DISCUSSION
A. Jurisdiction
We must begin by deciding whether this court has jurisdiction to hear this case, either as an interlocutory appeal or as an action seeking a writ of mandamus. We conclude that the unique characteristics of this case allow us, on this occasion, to decide the issues presented by the DOJ.
Mandamus is an extraordinary remedy that is “available only in those exceptional circumstances amounting to a judicial usurpation of power,” In re Ford Motor Co., 751 F.2d 274, 275 (8th Cir.1984), or “where the district court exceeds ‘the sphere of its discretionary power.’ ” In re Cessna Distrib. Antitrust Litig., 532 F.2d 64, 68 (8th Cir.1976) (quoting Will v. United States, 389 U.S. 90, 104, 88 S.Ct. 269, 278, 19 L.Ed.2d 305 (1967)). “Other factors which bear on the appropriateness of mandamus review include the need to correct error which is likely to recur and to provide guidelines for the resolution of novel and important questions.” Central Microfilm Serv. Corp. v. Basic/Four Corp., 688 F.2d 1206, 1212 (8th Cir.1982), cert. denied, 459 U.S. 1204, 103 S.Ct. 1191, 75 L.Ed.2d 436 (1983).
Crancer contends that it is within the district court’s discretion to order creation of a Vaughn index, and consequently the court did not act outside its jurisdiction in ordering the DOJ to create an index in this case. The DOJ argues that Exemption 7(A) is different from other exemptions due to case law from the Supreme Court, this court, and other courts of appeal that indicates it is never appropriate for a district court to require a Vaughn index when the government agency invokes Exemption 7(A).4
The DOJ’s argument is a novel one and has not been directly addressed by any court. If the DOJ is correct in its contention that the district court lacked authority to order a Vaughn index, then a writ would be the proper remedy. Because the issue of whether the writ is available is intertwined with the merits of this interlocutory matter, we must decide whether the district court had authority to require a Vaughn-type index in these circumstances. Cf. In re Brotherhood of Ry., Airline and S.S. Clerks, 605 F.2d 1073, 1074 (8th Cir.1979) (per curiam) (deciding to reach merits of dispute because “[i]f the District Court was without jurisdiction to issue the ... order, a court of appeals has jurisdiction to dissolve that order by means of a writ of mandamus.”).5
[533]*533B. Use of Vaughn Indices and Exemption 7(A)
This case is unique because it is not a review of a district court’s order that documents be disclosed, nor is it a review of a district court’s decision that documents are exempt from disclosure. This case asks us to determine what a district court may do while deciding whether documents are or are not exempt from disclosure.
The district court has the responsibility to review the applicability of the government’s claimed exemption de novo. 5 U.S.C. § 552(a)(4)(B). This task is difficult because ordinarily a government agency, and not the court, has access to the documents in question. The seminal case of Vaughn v. Rosen articulated concerns about the need to find a mechanism that would “permit the court system effectively and efficiently to evaluate the factual nature of disputed information.” Vaughn, 484 F.2d at 826. From these concerns, the D.C. Circuit created what is now known as a Vaughn index, which does nothing more than “correlate statements made in the Government’s refusal justification with the actual portions of the document.” Id. at 827 (footnote omitted). Currently, a Vaughn index is understood to perform three important tasks:
[I]t forces the government to analyze carefully any material withheld, it enables the trial court to fulfill its duty of ruling on the applicability of the exemption, and it enables the adversary system to operate by giving the requester as much information as possible, on the basis of which he can present his case to the trial court.
Lykins v. Department of Justice, 725 F.2d 1455, 1463 (D.C.Cir.1984).
There is no prescribed form for a Vaughn index; any form is acceptable as long as the affidavits provided by the government assist the court’s efforts to decide the issues at hand. See, e.g., Keys v. Department of Justice, 830 F.2d 337, 349 (D.C.Cir.1987). Regardless of form, however, certain components are integral parts of any Vaughn index. Specifically, Vaughn indices usually communicate descriptions of each and every document contained in the file, including a general description of each document’s contents and general facts about their creation (such as date, time, and place). For each document, the exemption claimed by the government is identified, and an explanation as to why the exemption applies to the document in question is provided.6
The government argues the district court lacks the authority to require a Vaughn index because such an index is not required when Exemption 7(A) is invoked. The Supreme Court has indicated that with respect to Exemption 7(A), the government need not point to a particularized harm to a particular enforcement proceeding; instead, the government may argue (and courts may hold) that certain general categories of documents will typically interfere with enforcement proceedings if the documents are disclosed. NLRB v. Robbins Tire & Rubber Co., 437 U.S. 214, 223-24, 236, 98 S.Ct. 2311, 2317-18, 2324, 57 L.Ed.2d 159 (1978). In the wake of Robbins, many courts of appeal have altered their views on the need for a Vaughn index when Exemption 7(A) is involved. The rationale underlying these post-Robbins decisions has been that a Vaughn index is unnecessary because the government is permitted to demonstrate interference based on categories of documents and need not demonstrate interference with enforcement proceedings on a document-by-document basis. E.g., Church of Scientology of Cal. v. IRS, 792 F.2d 146, 152 (D.C.Cir.1986) (Scalia, J.); Barney v. IRS, 618 F.2d 1268, 1273 (8th Cir.1980) (per curiam) (“Under exemption 7(A) the government is not [534]*534required to make a specific factual showing with respect to each withheld document that disclosure would actually interfere with a particular enforcement proceeding.”). Moreover, in each of these cases, the appellate court was reviewing a district court’s decision not to require a Vaughn index when the government had already provided adequate descriptions of the documents sought, as well as adequate explanations as to how the particular types of documents at issue could interfere with law enforcement proceedings. E.g., Wright v. OSHA, 822 F.2d 642, 647 (7th Cir.1987); Lewis v. IRS, 823 F.2d 375, 378 (9th Cir.1987); Curran v. Department of Justice, 813 F.2d 473, 476 (1st Cir.1987).
At no time, however, has an appellate court suggested that Robbins alters the district court’s statutory obligation to review the claimed exemption’s applicability. Robbins does not allow for exemption merely because documents appear in a law enforcement agency’s file. E.g., Curran, 813 F.2d at 475; Crooker v. Bureau of Alcohol, Tobacco & Firearms, 789 F.2d 64, 67 (D.C.Cir.1986). When an agency relies upon Robbins and offers categorical justifications for exemption under Exemption 7(A), the agency must still review each document individually. Bevis v. Department of State, 801 F.2d 1386, 1389 (D.C.Cir.1986). More specifically, the agency must perform the following tasks:
First, it must define its categories functionally. Second, it must conduct a document-by-document review in order to assign documents to the proper category. Finally, it must explain to the court how the release of each category would interfere with enforcement proceedings.
Id. at 1389-90. The district court is well within its authority to verify that the agency has actually examined and properly categorized each document. It may accomplish this task by requiring an affidavit that describes, on a document-by-document basis, the documents in the file, the categories into which each document is placed, and a description of how disclosure of each category of documents might interfere with enforcement proceedings.7 Robbins merely prevents a district court from ordering a document-by-document explanation as to how each document will interfere with enforcement proceedings. In other words, though the district court cannot require the government to justify its decision to deny disclosure on a document-by-document basis, it can require the government to justify its chosen categorization on a document-by-document basis. Furthermore, the district court has the authority to verify that the government has fullfilled its obligation to examine each document individually.8
The government argues that our decision in Barney prohibits the district court from entering the order at issue here. We disagree. In Barney, the district court granted summary judgement in favor of the government without requiring the government create a Vaughn index. We affirmed the grant of summary judgment despite the lack of a Vaughn index because both we and the district court were satisfied that the government’s affidavits adequately described the documents, the categories to which they belonged, and the possible harms of disclosure. Id. at 1272-73. If the district court is not provided with these materials, or if it finds the materials provided by the government to be insufficient, the district court must be permitted to require further information from the government.
In the case at bar, the record clearly indicates that the district court was not satisfied with the affidavits supplied by the [535]*535government. The district court’s dissatisfaction is understandable given the government’s blanket assertion that all 13,800 documents, accumulated over a 15-year span, fit neatly into nine categories described over the course of five pages. Furthermore, Crancer raised arguments that, in the district court’s belief, raised serious questions about the validity of the government’s search and categorization. The district court has the discretion to require further categorization as well as assurances that all the documents actually belong in the categories. Moreover, the court may believe it needs information about each document, not only to verify that the government has fulfilled its obligation to examine each document, but also to enable it to understand or challenge the categories created by the government.9 If the district court is unable to verify that the government has examined and correctly categorized each document, Exemption 7(A) will once again become a de facto blanket exemption of all documents in law enforcement files. See Bevis, 801 F.2d at 1389 (“Absent such individual scrutiny, the categories would be no more than smaller versions of the ‘blanket exemptions’ disapproved by Congress in its 1974 amendment of FOIA”).
These concerns cannot be alleviated by simply requiring the government to provide “more specific, distinct categories” as suggested by the dissent, post at 537. Further categorization is an appropriate remedy when the district court finds the categories inadequate, confusing, or otherwise unhelpful. The case at bar does not present such a situation; instead, the concern at issue is whether all the documents in the file are described by the government’s categories. This issue cannot be resolved by requiring further categorization. Similarly, we do not agree with the dissent’s view that “[t]he threat of disclosure ... motivates the government to make a proper showing that the exemption applies.” Post at 537. In a situation similar to this one, where the district court finds itself presented with an insufficient record upon which to make a ruling, the district court is unlikely to simply order disclosure. Even if the court were to order disclosure, it is quite likely that this court would remand the case for further development of the record, thereby saddling the district court with an inadequate record and no mechanism to insure the government’s categories accurately reflect the true contents of the file. Without an index to perform this vital function, the district court will be forced to accept the government’s contentions with little to no scrutiny. Consequently, we believe the effect of the dissenting opinion would be to return “blanket status” to Exemption 7(A) and deny meaningful disclosure whenever the exemption is invoked, despite Congress’ intent to the contrary.
The government also argues that the same court that decided Vaughn v. Rosen has said that Vaughn indices are inappropriate when Exemption 7(A) is invoked. A careful reading of these cases, however, indicates that the D.C. Circuit only disapproves the use of Vaughn indices insofar as they would be used to demonstrate how each document would actually interfere with enforcement proceedings. See, e.g., Church of Scientology, 792 F.2d at 152 (“A Vaughn index would have served no purpose since ... Exemption 7(A) ... did not require a showing that each individual document would produce such interfer-ence_”); Crooker, 789 F.2d at 67 (“Because generic determinations [of interference] are permitted, the government need not justify its withholdings document-by-document_”). No case from the D.C. Circuit (or from any other circuit) has prohibited a district court from requiring descriptions of a file’s contents on a doe-ument-by-document basis. In fact, the D.C. Circuit has confirmed the government’s obligations to review all the documents in a requested file and explain how each document fits into the categories cho[536]*536sen by the government. See Bevis, 801 F.2d at 1389-90. Given this obligation, and given the district court’s duty to conduct a de novo review of the government's decision to not disclose documents, district courts must be able to ask for this type of document-by-document information. Otherwise, district courts will be nothing more than rubber stamps for the government’s decision to deny disclosure. The FOIA does not permit such a limited role for the district courts.
Having concluded that it is within the district court’s power and discretion to order a document-by-document index, we cannot grant the government’s application for a writ of mandamus. Central Micofilm, 688 F.2d at 1212. (“[Arguable error within the scope of trial court discretion is not a proper basis for mandamus.”).
III. CONCLUSION
Although we agree that invocation of Exemption 7(A) may alter the form of the Vaughn index, Exemption 7(A) does not eliminate the need for some mechanism to perform the functions historically associated with an index. Consistent with this opinion, it lies within the district court’s power to order the government to produce a Vaughn index when Exemption 7(A) is invoked. Furthermore, the district court did not abuse its discretion in doing so in this case. Consequently, we deny the application for writ of mandamus and dismiss the interlocutory appeal.