would reveal an informer’s identity; all the FBI has to do is to state that the information was furnished by a confidential source and it is exempt. (Emphasis added by district court).
120 Cong. Rec. 36871 (1974). Congress then passed the amendments over the veto of the President. The Court in the ease reviewed above then held that the word “source” in “confidential source” included information provided by law enforcement agencies, and withheld information provided by such agencies. 410 F.Supp. at 1302-03.
Maroscia v. Levi, 569 F.2d 1000,1002 (7th Cir. 1977), implicitly holds that certain files containing the identities of persons interviewed by the FBI and information received from them were “investigatory records compiled for law enforcement purposes”, acquired under an assurance of confidentiality, and therefore exempt. See also opinion of Chief Judge Wright, concurring in part and dissenting in part, in Marks v. C.I.A., 590 F.2d 997, 1011, n.19 (D.C.Cir. 1978), which presages the holding in the instant case.
Therefore, it is not necessary to discuss the extent to which the documents do, or might, disclose the identity of the confidential informant. This exemption from disclosure rests on broader grounds. Because the three records as “confidential information” under (b)(7)(D) are exempt in their entirety from disclosure, it is unnecessary and contrary to the statute to consider redaction of the details of the documents that might identify the informants.
We have examined the three documents in camera, and determined that § 552(b)(7)(D) of the statute exactly describes the documents in question and the information they contain. Each of the three documents consists of confidential information only from confidential sources and each contains reports of criminal activities committed by several prison inmates, including Duffin and others. The documents also contain information with respect to modus operandi, that apart from names, could be used to identify other prisoners engaged in criminal activities and their confederates in crime. The sources of the information are stated to be several confidential informants. The records are investigatory in nature. They are compiled by the Bureau of Prisons, which we find to be a criminal law enforcement authority, acting in the course of a criminal investigation for law enforcement purposes.3
It is significant that Congress in the Privacy Act also recognized that prisons were law enforcement agencies, by exempting-
records . . . maintained by an agency or component thereof which performs as its principal function any activity pertaining to the enforcement of criminal laws, including . . . the activities of ... correctional .. . authorities . . .
5 U.S.C. § 552a(j)(2). (Emphasis added) •Prisons perform as their principal function one of the most important duties pertaining to the enforcement of the criminal laws, i.e., the execution of sentences in criminal cases adjudging confinement to the custody of the Attorney General. Therefore, they were properly determined by Congress to be a law enforcement agency or component thereof. As such, prison authorities also necessarily have the obligation, as here, to impose discipline for violation of the criminal laws and prison regulations by convicted prisoners who are confined in their custody. To do this the prison must investigate and maintain sources of intelligence. In so acting prisons perform law enforcement functions. Also, our in camera examination of the three records, and the findings of the District Court under the Privacy Act disclose that each of the three documents consists of “confidential information furnished only by the confidential source.” Therefore, under § 552(b)(7)(D) of the Freedom of Information Act, each of the documents is exempt from disclosure in its entirety.
Under such circumstances, judicial economy allows this Court to affirm the judg
3
The prison investigated the sale and distribution of narcotics and other controlled substances for the purpose of enforcing the criminal laws, particularly against its inmates.