honest broker

one who works with opposing sides in order to bring about an agreement after all the bad blood on both sides, we need to find someone who hasn't been influenced and can act as an honest broker Synonyms broker, buffer, conciliator, go-between, mediator, interceder, intercessor, intermediary, intermediate, interposer, middleman, peacemakerRelated Words troubleshooter; moderator; bargainer, negotiant, negotiator; appeaser, pacificator, pacifier, reconciler; agent, attorney, deputy, factor, procurator, proxy; liaison, medium; ambassador, emissary, envoy, legate, messenger; delegate, representative; busybody, interferer, meddler; arbiter, arbitrator, judge, referee, umpire; adviser (also advisor), counselor (or counsellor)