Harold Knutson

Harold Knutson (1880-1953) was a Norwegian-born Member of the United States House of Representatives from Minnesota, serving from 1917-1949, until he was defeated in 1948. In his last term, he served as the Chairman of the Ways and Means Committee.

Harold Knutson in The Man With the Iron Heart
Harold Knutson became the Chairman of the Ways and Means Committee after the Republicans gained control of Congress in 1946. Like the majority of Republicans, Knutson was against the continued occupation of Germany.

Note: This is somewhat speculative, as Knutson wasn't specifically named in the text, but there is no obvious reason it would not be Knutson in The Man With the Iron Heart timeline.