Question: What British politician was a member of No Turning Back who was also the Secretary of State for Work and Pensions at one time?
Context: George Iain Duncan Smith (born 9 April 1954), often referred to by his initials IDS, is a British Conservative Party politician.  The Secretary of State for Work and Pensions from 2010 to 2016, he was previously the Leader of the Conservative Party and Leader of the Opposition from 2001 to 2003.  He was first elected to Parliament at the 1992 general election as the MP for Chingford—which he represented until the constituency's abolition in 1997—and he has represented its successor constituency of Chingford and Woodford Green ever since. Her Majesty's Principal Secretary of State for Work and Pensions, or informally Work and Pensions Secretary is a post in the British Cabinet, responsible for the Department for Work and Pensions.  It was created on 8 June 2001 by the merger of the Employment division of the Department for Education and Employment and the Department of Social Security. Andrew David Smith (born 1 February 1951) is a British Labour Party politician who was the Member of Parliament (MP) for Oxford East from 1987 until 2017.  He served in the Cabinet as Chief Secretary to the Treasury from 1999 to 2002 and then as Secretary of State for Work and Pensions from 2002 to 2004. No Turning Back is a group within the British Conservative Party advocating Thatcherite policies.  It was founded in 1985 to defend Margaret Thatcher's free-market reforms.  The group was named in honour of Thatcher's 1980 Conservative conference quote "U-turn if you want to.  The lady's not for turning."  No Turning Back published less material in the nineties and became involved in Conservative party in-fighting, resulting in both Michael Portillo and Francis Maude leaving the group, but became more prominent during Iain Duncan Smith's time as Conservative leader because he had been a member until he was elected. David Blunkett, Baron Blunkett, PC (born 6 June 1947) is best known as a British politician and more recently as an academic, having represented the Sheffield Brightside and Hillsborough constituency for 28 years through to 7 May 2015 when he stepped down at the general election.  Blind since birth, and coming from a poor family in one of Sheffield's most deprived districts, he rose to become Education and Employment Secretary, Home Secretary and Work and Pensions Secretary in Tony Blair's Cabinet following Labour's victory in the 1997 general election. The Shadow Secretary of State for Employment was an office within British politics held by a member of Her Majesty's Loyal Opposition.  The duty of the office holder was to scrutinise the actions of the government's Secretary of State for Employment and develop alternative policies.  The office was replaced by that of Shadow Secretary of State for Work and Pensions after the creation of the Department for Work and Pensions. Stephen Crabb{'1': ", '2': ", '3': ", '4': "} (born 20 January 1973) is a British Conservative Party politician.  He has been the Member of Parliament for Preseli Pembrokeshire since the 2005 general election and was Secretary of State for Work and Pensions from March 2016 until July 2016, when Prime Minister David Cameron resigned and Theresa May took over as Prime Minister and Leader of the Conservative Party.  He has previously been a government whip, a junior minister for Wales and the Secretary of State for Wales. The Shadow Secretary of State for Work and Pensions is an office within British politics held by a member of Her Majesty's Loyal Opposition.  The duty of the office holder is to scrutinise the actions of the government's Secretary of State for Work and Pensions and develop alternative policies.  The office holder is a member of the Shadow Cabinet. 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. Peter Gerald Hain, Baron Hain, PC (born 16 February 1950) is a British Labour Party politician, who was the Member of Parliament (MP) for Neath between 1991 and 2015, and served in the Cabinets of both Tony Blair and Gordon Brown.  He was the Leader of the House of Commons from 2003 to 2005 and Secretary of State for Northern Ireland from 2005 to 2007 under Blair, and as Secretary of State for Work and Pensions and Secretary of State for Wales from 2007 to 2008 under Brown.  In 2007, he ran for the Deputy Leadership of the Labour Party, coming fifth out of six candidates, although his failure to declare donations during this contest led to his resignation in 2008.  He later returned to the Cabinet from 2009 to 2010 as Welsh Secretary, before becoming Shadow Welsh Secretary in Ed Miliband's Shadow Cabinet from 2010 until 2012, when he announced his retirement from front-line politics.  In 2014 he announced he would stand down as the MP for Neath at the 2015 general election.  He was nominated for a life peerage in the 2015 Dissolution Honours.  Writing in the "Guardian", he subsequently outlined his views on House of Lords reform.  He came to the UK from South Africa as a teenager, and was a noted anti-apartheid campaigner in the 1970s.  He was also Honorary Vice-President of the Campaign for Homosexual Equality.  Peter Hain is on the board of African Potash, a company with a focus on building a vertically integrated platform for the mining, production and distribution of fertiliser.
Answer: Iain Duncan Smith