Hoppo men

from The Collaborative International Dictionary of English v.0.48

Hoppo \Hop"po\, n.
   (a) A collector of customs, as at Canton; an overseer of
       commerce.
   (b) A tribunal or commission having charge of the revenue
       derived from trade and navigation. [China]
       [1913 Webster]

   {Hoppo men}, Chinese customhouse officers.
      [1913 Webster]