[The Conversation Africa] A powerful new book on Nelson Mandela and Winnie Madikizela-Mandela has just been published. Winnie and Nelson: Portrait of a Marriage is at once a double biography of South Africa's two famous liberation leaders and a historical love story about their personal lives. Mandela was imprisoned for 27 years during apartheid and went on to become the country's first democratic president. For her part Madikizela-Mandela was persecuted relentlessly by the white minority government as she organised the resistance.