The Statute: § 7112. Determination of appropriate units for labor organization representation
(a) The Authority shall determine the appropriateness of any unit. The Authority shall determine in each case whether, in order to ensure employees the fullest freedom in exercising the rights guaranteed under this chapter, the appropriate unit should be established on an agency, plant, installation, functional, or other basis and shall determine any unit to be an appropriate unit only if the determination will ensure a clear and identifiable community of interest among the employees in the unit and will promote effective dealings with, and efficiency of the operations of the agency involved.
(b) A unit shall not be determined to be appropriate under this section solely on the basis of the extent to which employees in the proposed unit have organized, nor shall a unit be determined to be appropriate if it includes--
(1) except as provided under section 7135(a)(2) of this title, any management official or supervisor;
(2) a confidential employee;
(3) an employee engaged in personnel work in other than a purely clerical capacity;
(4) an employee engaged i