Myrmidon

Myrmidon (noun) is a faithful follower or subordinate who carries out orders unquestioningly and unscrupulously.  The word originates from the legendary Greek people, Myrmidons or Myrmidones, who were highly skilled and courageous warriors commanded by Achilles during the Trojan War.  

Example:
  
The boss offered more promotions and raises to her myrmidons than those workers who occasionally questioned her and provided alternative solutions.

Other Uses:

“With unabated ardor the vindictive man of lay and his myrmidons pressed forward.” W.H. Ainsworth.

“An impediment and a slaver,” she said, involuntarily allowing her own teeth to emerge in a long-suppressed expression of hostility as she used the maneuvering thrusters to dislodge the hated second myrmidon.” Simon and Schuster: Star Trek: Typhon Pact: Seize the Fire