Henchman

A henchman is a loyal employee, supporter, or aide to some powerful figure engaged in nefarious or criminal enterprises. A henchman is typically relatively unimportant in the organization, a minion, whose value lies primarily in their unquestioning loyalty to their leader. The term henchman is often used derisively (even comically) to refer to an individual of low status who lacks any moral compass of their own. (Wikipedia)