The employees of the Department shall constitute a single and separate worldwide bargaining unit, from which there shall be excluded—
employees engaged in personnel work in other than a purely clerical capacity; and
employees engaged in criminal or national security investigations or who audit the work of individuals to insure that their functions are discharged honestly and with integrity.
[Pub. L. 96–465, title I, § 1012], Oct. 17, 1980, [94 Stat. 2135].)