Question: The younger brother of Harvey Jewell served as the national chairman for which American political party?
Sentence (from "Marshall Jewell"): Marshall Jewell (October 20, 1825February 10, 1883) was a manufacturer, pioneer telegrapher, telephone entrepreneur, world traveler, and political figure who served as 44th and 46th Governor of Connecticut, the U.S. Minister to Russia, the 25th United States Postmaster General, and Republican Party National Chairman.
Relevant evidence: Yes