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Douglas Harper's Etymology Dictionary
power-broker

1961, apparently coined by T.H. White in reference to the 1960 U.S. presidential election; from power (n.) + broker (n.).

Wiktionary
power-broker

n. (alternative spelling of power broker English)

Usage examples of "power-broker".

Francisco had initially found the Americans' unpretentious ways amusing, but lately more than a bit exasperating as the shock of their arrival wore off and Europe's power-brokers lapsed back into old habits of confusing ostentation with authority.