henchman
From Longman Dictionary of Contemporary Englishhenchmanhench‧man /ˈhentʃmən/ noun (plural henchmen /-mən/) [countable] SUPPORT A PERSON, GROUP, OR PLANa faithful supporter of a political leader or a criminal, who is willing to do illegal things or use violenceExamples from the Corpushenchman• The Abrego henchmen hit on a seemingly foolproof idea.• Sinatra arrived and left in a helicopter with all his henchmen.Origin henchman (1300-1400) hengest “male horse” ((12-14 centuries)) (from Old English) + man