The Devil's Chessboard by David Talbot
https://www.amazon.com/Devils-Chessboard-Dulles-Americas-Government/dp/0062276166

Some reviews:

“A Cold War villain of realpolitik whose successes and blunders were unrivaled. As framed by Talbot, Dulles’s extra-legal interventions, coups, slush funds, and ex-Nazi collaborations were as much pro-corporate as anti-Communist, more Cheneyish than Nixonian.... He’d fit right into our globalized, subcontracted, and hypersurveilled era.” (New York Magazine)

“Dulles is unmasked as the backstage manipulator of US policy (foreign and domestic) from the Cold War up to his skillful defense of the highly suspect Warren Commission report. Those who scoff at conspiracy theories might have a change of mind after reading this book.” (Boston Globe, Pick of the Week)

“A frightening biography of power, manipulation, and outright treason…The story of Allen Dulles and the power elite that ran Washington, D.C., following World War II is the stuff of spy fiction…All engaged American citizens should read this book and have their eyes opened.” (Kirkus, starred review)

John Foster Dulles, Allen's brother, was Secretary of State under Eisenhower. He was kind of a loose cannon and Ike kept him on a short leash. At the time people believed he triggered the Hungarian uprising by half promising American support to dissident Eastern Europeans. Ambrose describes the relationship between Ike and Dulles is his 2 volume Eisenhower biography. He and Eisenhower had a personal relationship and he had access to all of Ike's papers plus extensive conversations. I think it's his best work.

I appreciate the recommendation regarding the Ike bio...