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The Privacy Act requires each agency to publish a notice of its systems of records in the Federal Register. This is called a System of Record Notice (SORN).
NIST SP 800-79-2 under SORN
An official public notice of an organization’s system(s) of records, as required by the Privacy Act of 1974, that identifies: (i) the purpose for the system of records; (ii) the individuals covered by information in the system of records; (iii) the categories of records maintained about individuals; and (iv) the ways in which the information is shared.
NIST SP 800-53 Rev. 4