Question: What party was the person who broke Barbara Anne Castle's record as the longest-serving female MP in the House of Commons?

full_context: Document 1: Harriet Harman: Harriet Ruth Harman, {'1': ", '2': ", '3': ", '4': "} (born 30 July 1950) is a British solicitor and Labour Party politician who has been a Member of Parliament (MP) since 1982, first for Peckham, and then for its successor constituency of Camberwell and Peckham since 1997. She has served in various Cabinet and Shadow Cabinet positions and, in her role as Deputy Leader of the Labour Party, she was twice the Acting Leader of the Labour Party and Leader of the Opposition: from May to September 2010 and from May to September 2015. She remains the only politician to have held this position on two separate occasions.
Document 2: Mildred Gordon (politician): Mildred Gordon (née Fellerman; 24 August 1923 – 8 April 2016) was a British Labour politician.
Document 3: Stanley Clinton-Davis, Baron Clinton-Davis: Stanley Clinton Clinton-Davis, Baron Clinton-Davis, PC (born 6 December 1928), born Stanley Clinton Davis, is a British Labour politician, former European Commissioner, former minister and solicitor. He served as Member of Parliament (MP) for Hackney Central (1970–1983), and was a minister in the Labour governments of Prime Ministers Harold Wilson, James Callaghan and Tony Blair. He was European Commissioner in the Delors Commission (1985–1989). In 1990, he became a Life Peer as Baron Clinton-Davis of Hackney, in the London Borough of Hackney, sitting on the Labour benches in the House of Lords, and changed his name to Stanley Clinton-Davis by deed poll.
Document 4: Laura Smith (politician): Laura Smith is a British Labour Party politician who was elected as the Member of Parliament (MP) for Crewe and Nantwich at the 2017 general election, having defeated the incumbent Conservative Edward Timpson.
Document 5: Ann Winterton: Jane Ann, Lady Winterton (née Hodgson; born 6 March 1941 in Sutton Coldfield) is a British Conservative Party politician who was the Member of Parliament (MP) for Congleton from 1983 to 2010. She is married to Sir Nicholas Winterton, also a former Conservative MP.
Document 6: Clare Short: Clare Short (born 15 February 1946) is a British politician, and a member of the Labour Party. She was the Member of Parliament for Birmingham Ladywood from 1983 to 2010; for most of this period she was a Labour Party MP, but she resigned the party whip in 2006 and served the remainder of her term as an Independent. She stood down as a member of parliament at the 2010 general election. Short was Secretary of State for International Development in the government of Prime Minister Tony Blair from 3 May 1997 until her resignation from that post on 12 May 2003. Shortly before her retirement from Parliament in 2010, she was strongly rebuked by her own party when she announced her support for a hung parliament, a situation which subsequently occurred at the 2010 General Election.
Document 7: Gwyneth Dunwoody: Gwyneth Patricia Dunwoody (née Phillips; 12 December 1930 – 17 April 2008) was a British moderate Labour Party politician, who was the Member of Parliament (MP) for Exeter from 1966 to 1970, and then for Crewe (later Crewe and Nantwich) from 1974 to her death in 2008. She had a reputation as a fiercely independent parliamentarian, described as "intelligent, obstinate, opinionated and hard-working".
Document 8: James Callaghan: Leonard James Callaghan, Baron Callaghan of Cardiff, {'1': ", '2': ", '3': ", '4': "} (27 March 1912 – 26 March 2005), often known as Jim Callaghan, was a British politician who served as Prime Minister of the United Kingdom from 1976 to 1979 and Leader of the Labour Party from 1976 to 1980. Callaghan is to date, the only British politician in history to have served in all four of the "Great Offices of State", having been Chancellor of the Exchequer from 1964–67, Home Secretary from 1967-70, and Foreign Secretary from 1974, until his appointment as Prime Minister in 1976. As Prime Minister, he had some successes, but is mainly remembered for the "Winter of Discontent" of 1978–79. During a very cold winter, his battle with trade unions led to massive strikes that seriously inconvenienced the public, leading to his defeat in the polls by Conservative leader Margaret Thatcher.
Document 9: Barbara Follett (politician): Daphne Barbara Follett ( Hubbard; born 25 December 1942) is a British Labour Party politician who served as the Member of Parliament (MP) for Stevenage from 1997 until 2010. During this time she held several parliamentary and ministerial positions. In the decade before entering Parliament she played a major part in transformation of the Labour Party, firstly by making members more aware of their visual impact on voters and secondly by co-founding and running two organisations, Labour Women's Network and Emily's List UK, which spearheaded reforms that helped Labour to return a record 101 women to Parliament in 1997. Following the United Kingdom Parliamentary expenses scandal, she repaid more than £32,000 which she had claimed in expenses. She stood down in 2010 in order to take over the running of her husband, bestselling author Ken Follett's, growing business.
Document 10: Diane Abbott: Diane Julie Abbott (born 27 September 1953) is a British Labour Party politician who was appointed Shadow Home Secretary in October 2016. She was first elected as the Member of Parliament (MP) for Hackney North and Stoke Newington at the 1987 general election, when she became the first black woman to hold a seat in the House of Commons.
Document 11: Eleanor Smith (politician): Eleanor Patricia Smith is a British Labour Party politician. She has been the Member of Parliament (MP) for Wolverhampton South West since the 2017 general election. She is the first MP from an African Caribbean background to represent a constituency in the West Midlands; her constituency was formerly represented by the anti-immigration Conservative MP Enoch Powell.
Document 12: Barbara Castle: Barbara Anne Castle, Baroness Castle of Blackburn, PC, GCOT (née Betts, 6 October 1910 – 3 May 2002) was a British Labour Party politician who was the Member of Parliament for Blackburn from 1945 to 1979, making her the longest-serving female MP in the history of the House of Commons, until that record was broken in 2007 by Gwyneth Dunwoody. She later became the Member of the European Parliament for Greater Manchester from 1979 to 1989. One of the most significant Labour Party politicians of the 20th century, she served in the Cabinet under Prime Minister Harold Wilson in a number of roles, including as Secretary of State for Employment, Secretary of State for Health and Social Services, and First Secretary of State.
Document 13: Michelle Roberts: Michelle Hopkins Roberts (née Thomas; born 29 February 1960) is an Australian politician who has been a Labor Party member of the Legislative Assembly of Western Australia since 1994. She served as a minister in the governments of Geoff Gallop and Alan Carpenter between 2001 and 2008. In November 2015, Roberts became the longest-serving female parliamentarian in Western Australia's history, breaking the record set by Liz Constable. She was a high schoolteacher,
Document 14: The Iron Lady (film): The Iron Lady is a 2011 British-French biographical drama film based on the life and career of Margaret Thatcher (1925–2013), a British stateswoman and politician who was the longest-serving Prime Minister of the United Kingdom of the 20th century. The film was directed by Phyllida Lloyd. Thatcher is portrayed primarily by Meryl Streep, and, in her formative and early political years, by Alexandra Roach. Thatcher's husband, Denis Thatcher, is portrayed by Jim Broadbent, and by Harry Lloyd as the younger Denis. Thatcher's longest-serving cabinet member and eventual deputy, Geoffrey Howe, is portrayed by Anthony Head.
Document 15: Premiership of Tony Blair: The premiership of Tony Blair began on 2 May 1997 and ended on 27 June 2007. Whilst serving as Prime Minister of the United Kingdom, Blair concurrently served as the First Lord of the Treasury, the Minister for the Civil Service, the Leader of the Labour Party (until Gordon Brown was declared Labour leader on 24 June 2007), and a member of parliament for the constituency of Sedgefield in County Durham. He remains a Privy Counsellor having first been appointed in July 1994 when he became Leader of the Opposition. Tony Blair is the Labour Party's longest-serving Prime Minister, and having led the party to three consecutive general election victories, the only Labour prime minister to serve two full consecutive terms.
ground_truth: Labour Party