middleman

noun

• Someone who buys many goods and resells to others
• A person who facilitates a transaction or negotiation between two parties.
• A person who acts as an intermediary or go-between, especially in commercial dealings.
• A person who goes between buyers and sellers.
• A person who tries to settle a disagreement.
• A person who profits unfairly from a transaction.
• A distributor or other intermediary in a supply chain.