WordNet (r) 3.0 (2006):

organization man
    n 1: an employee who sacrifices his own individuality for the
         good of an organization

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "organization man":
   Babbitt, Middle American, Philistine, anal character, bourgeois,
   burgher, compulsive character, conformer, conformist,
   conventionalist, formalist, methodologist, middle-class type,
   model child, parrot, pedant, perfectionist, plastic person,
   precisian, precisianist, sheep, square, teenybopper, trimmer,
   yes-man