powerbroker

/ˈpaʊər ˌbroʊkər/
noun
  1. A person who has a lot of influence and uses it to control or arrange political or business deals.
    • The senator was known as a powerbroker who decided which bills would pass.
    • In Hollywood, a few powerful agents act as powerbrokers for movie deals.
    • The local powerbroker arranged the meeting between the mayor and the developers.
Synonyms
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