The Freedom of Information Act (FOIA), 5 U. S. C. § 552 (1976 ed. and Supp. IV), does not require the disclosure of "investigatory records compiled for law enforcement purposes" when the release of such records would interfere with effective law enforcement, impede the administration of justice, constitute an unwarranted invasion of privacy, or produce certain other specified consequences. § 552(b)(7).[1]*618 The sole question presented in this case is whether information contained in records compiled for law enforcement purposes loses that exempt status when it is incorporated into records compiled for purposes other than law enforcement.

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