middleman

Noun

• a person who is in a position to give you special assistance
  • he used his business contacts to get an introduction to the governor
    

• the performer in the middle of a minstrel line who engages the others in talk

• someone who buys large quantities of goods and resells to merchants rather than to the ultimate customers

Related words

• Synonyms: 
  contact , interlocutor , jobber , wholesaler