A black, Jewish activist, she has been a teacher, education advisor on Equalities and Development Education and a community organiser. She was elected vice chair of her local Labour Party in South Thanet and was one of the leading figures in the campaign to defeat the leader of UKIP, Nigel Farage, in the 2015 General Election. Walker campaigned for Jeremy Corbyn to be leader and was vice chair of Momentum. Her award winning memoir Pilgrim State is on the syllabuses of many Universities and her one woman show The Lynching has toured in the UK and overseas.

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