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https://en.wikipedia.org/wiki/Without_Remorse
Excerpt
Peter Henderson: Minor Senate aide, revealed to be the KGB mole (codename “Cassius”) that burned Boxwood Green.

Appears in the next novel Red Rabbit; later caught by the CIA in The Hunt for Red October (1984) and made as double agent.

He was later offered his freedom in The Cardinal of the Kremlin (1988) due to the importance of secret information on the Soviet Union that he brought..

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https://jackryan.fandom.com/wiki/Peter_Henderson
Excerpt
Peter Henderson, codenamed Cassius, is a character that appears in several Tom Clancy novels.

Peter Henderson is a KGB mole that infiltrated the US Government. In 1970, he was working as a minor Senate aide. During the planning of Boxwood Green, a secret operation to rescue Robin Zacharias and other POWs from a camp in Vietnam, Henderson outed the mission to the Soviet Union. Despite this, the mission’s lead, John Kelly captured the camp’s Soviet interrogator Nikolay Grishanov and used him as leverage to negotiate the transfer of Zacharias and the other POWs to Hanoi Hill where they would later be returned to the United States.

Following Kelly’s return from Vietnam, CIA Agent Robert Ritter misidentified Wally Hicks as the mole which lead to his death at the hands of Kelly. Kelly used a heroin overdoes to cover up Hicks’ assassination.

Henderson was later caught by the CIA in 1984 and made a double agent. In 1986, Henderson was offered his freedom due to his extensive knowledge of secret information on the Soviet Union..