176
Opinion of the Court
collects during an investigation also appear to be quite diverse. Although the Government emphasizes the difficulty of anticipating all the ways in which release of information ultimately may prove harmful, it does not dispute that the communications the FBI receives can range from the extremely sensitive to the routine.
The Government maintains that an assurance of confidentiality can be inferred whenever an individual source communicates with the FBI because of the risk of reprisal or other negative attention inherent in criminal investigations. See Superneau Declaration, App. 37-38. It acknowledges, however, that reprisal may not be threatened or even likely in any given case. Id., at 38. It may be true that many, or even most, individual sources will expect confidentiality. But the Government offers no explanation, other than ease of administration, why that expectation always should be presumed. The justifications offered for presuming the confidentiality of all institutional sources are less persuasive. The Government "is convinced" that the willingness of other law enforcement agencies to furnish information depends on a "traditional understanding of confidentiality." Id., at 40. There is no argument, however, that disclosure ordinarily would affect cooperating agencies adversely or that the agencies otherwise would be deterred from providing even the most nonsensitive information. The Government does suggest that private institutions might be subject to "possible legal action or loss of business" if their cooperation with the Bureau became publicly known. Id., at 41. But the suggestion is conclusory. Given the wide variety of information that such institutions may be asked to provide, we do not think it reasonable to infer that the information is given with an implied understanding of confidentiality in all cases.
Considerations of "fairness" also counsel against the Government's rule. Basic Inc., supra, at 245. The Govern-
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