honest broker
US /ˈɑnɪst ˈbroʊkər/
UK /ˈɑnɪst ˈbroʊkər/

1.
intermediario honesto, mediador imparcial
a neutral and impartial third party who facilitates negotiations or mediates disputes between other parties, without having a vested interest in the outcome
:
•
The diplomat acted as an honest broker in the peace talks.
El diplomático actuó como un intermediario honesto en las conversaciones de paz.
•
For the negotiations to succeed, they needed an honest broker both sides could trust.
Para que las negociaciones tuvieran éxito, necesitaban un intermediario honesto en quien ambas partes pudieran confiar.