Harvey Jewell (*May 26, 1820 – December 8, 1881) was a U.S. lawyer and politician who served as the Speaker of the Massachusetts House of Representatives from 1868 to 1871.
 Jewell was born in Winchester, New Hampshire on May 26, 1820, the first of ten children born to Pliny and Emily Alexander Jewell.
 His younger brother, Marshall Jewell (1825-1883) would later be elected Governor of Connecticut and would serve as President Grant's United States Postmaster General.
James Nicholas "Nick" Ayers (born August 16, 1982) is an American political strategist who has been Chief of Staff to the Vice President Mike Pence since July 2017.
 Prior to that, Ayers served as national chairman for Mike Pence's vice-presidential campaign in 2016, and as the former executive director of the Republican Governors Association from 2007 to 2010.
 He also was principal of C5 Creative Consulting, based in Atlanta, and is one of four leading figures in America First Policies, a pro-Trump nonprofit organization founded in January 2017.
 From November 2016 to January 2017, Ayers was a senior adviser to President-elect Donald Trump's transition team.
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.
 Jewell, distinguished for his fine "china" skin, grey eyes, and white eyebrows, was popularly known as the "Porcelain Man".
 As Postmaster General, Jewell made reforms and was intent on cleaning up the Postal Service from internal corruption and profiteering.
 Postmaster Jewell aided Secretary of the Treasury Benjamin H. Bristow shut down and prosecute the Whiskey Ring.
 President Grant, however, became suspicious of Jewell's loyalty after Jewell fired a Boston postmaster over non payment of a surety bond and asked for his resignation.
David North (born 1950) is an American Trotskyist.
 He is the national chairman of the Socialist Equality Party in the United States (SEP), formerly the Workers League.
 He served as the national secretary of the SEP until the party's congress in 2008.
 North was the principal political and theoretical leader of the International Committee of the Fourth International during the organization's split with the Workers Revolutionary Party.
 North is also the chairman of the International Editorial Board of the World Socialist Web Site, the voice of the ICFI.
 He is also an author of several books and articles on the history of the Socialist movement.
 He delivers lectures in politics and the history of Marxism.
Donald L. "Don" Fowler (born September 12, 1935) is an American political scientist, professor and political operative who served as National Chairman of the Democratic National Committee from 1995 to 1997, alongside Christopher J. Dodd as General Chairman during this same period.
The Independence Party of America (IPA) was a political party in the United States, founded on September 23, 2007 as a coalition of existing state parties bearing the Independence Party name.
 Its National Chairman was Frank MacKay, chairman of the Independence Party of New York.
 Dean Barkley, a former United States Senator and Independence Party of Minnesota activist, agreed to play an advisory role with the new party.
Charles T. Maynard (6 June 1970 – 14 August 2012) was a Bahamian politician.
 He was National Chairman of the Free National Movement political party (FNM).
 Formerly a member of Bahamian parliament, and a minister of youth, sports and culture, Maynard died of an apparent heart attack while campaigning for the FNM in 2012.
 He was 42, and had been considered a "rising political talent".
 He was the cousin of Bahamian Attorney-General Allyson Maynard Gibson.
Chen Changzhi (; born July 1945 in Hubei Province) is the national chairman of the China Democratic National Construction Association, a legally recognized non-Communist political party in China, and one of the Vice Chairmen of the Standing Committee of the National People's Congress of the People's Republic of China, having served in this capacity since 2008.
Frank Emmanuel Tolbert (February 3, 1910 – April 22, 1980) was a Liberian politician and brother of President William R. Tolbert, Jr. The oldest son of William R. Tolbert Sr., national chairman of the ruling True Whig Party, he grew up in Bensonville, attended Zion Praise Baptist Church, graduated from Liberia College, and became involved in politics relatively early in life.
 As his family became more and more closely connected to the family of Supreme Court Justice William V.S. Tubman, Frank began to become prominent: when Tubman ran for President in 1943, he was rumoured to be Tubman's first choice for Vice President, although his younger brother William was eventually chosen, perhaps because of Frank's unpredictable moods and violent temper.
Chama cha Haki na Usitawi (CHAUSTA) is a political party in Tanzania.
 The party was registered on 15 November 2001.
 Its founder and current chairman is James Mapalala, a former national chairman of the Civic United Front.

Question: The younger brother of Harvey Jewell served as the national chairman for which American political party?
Answer: Republican Party