The President, Safeguarding National Security Information, National Security Decision Directive 84 (NSDD 84) (Mar. 11, 1983) (full-text).
The Directive requires each executive branch agency that originates or handles classified information to adopt internal procedures to safeguard against unlawful disclosure of classified information. At a minimum, these agencies should require each person with authorized access to (1) classified information to sign a nondisclosure agreement as a condition of access and (2) Sensitive Compartmented Information (SCI) to sign a nondisclosure agreement with a prepublication review provision as a condition of access to SCI. The Directive also requires the Information Security Oversight Office to develop standardized nondisclosure agreements.