henchman
n. <贬>心腹,党羽,喽啰
If you refer to someone as another person's henchman, you mean that they work for or support the other person, especially by doing unpleasant, violent, or dishonest things on their behalf.
1. someone who assists in a plot
The gang chief went everywhere accompanied by his henchman.
那流氓头子到什么地方都有手下的狗腿子跟着.
He has never regarded you as a friend, only a henchman.
他根本没把你当朋友, 只不过把你当成了他的腿子.