29 CFR 14.22: Availability of classified information to persons not employed by the Department of Labor.

(a) Approval for access. Access to classified information in the possession or custody of the primary organizational units of the Department by individuals who are not employees of the executive branch shall be approved in advance by the DOL Document Security Officer.

(b) Access to Top Secret material. Access to Top Secret Information within the primary organizational units of the DOL by employees of other Federal agencies must be approved in advance by the Top Secret Control Officer of the primary organizational unit.

(c) Access to Secret and Confidential information. Secret and Confidential information may be made available to properly cleared employees of other Federal departments or outside agencies if authorized by the primary organizational units having custody of the information.