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FILE - In this June 27, 2011 file photo, Yemeni activist Tawakkul Karman chants slogans along with anti-government protestors, during a demonstration demanding the resignation of Yemeni President Ali Abdullah Saleh, in Sanaa, Yemen. Liberian President Ellen Johnson Sirleaf, Liberian activist Leymah Gbowee and Tawakkul Karman of Yemen have won the 2011 Nobel Peace Prize, the Norwegian Nobel Committee announced Friday, Oct. 7, 2011. (AP Photo/Hani Mohammed, File)

Nobel Peace Prize winners

Ellen Johnson Sirleaf, Leymah Gbowee and Tawakul Karman, who have fought tirelessly to organize women for human rights, shared the 2011 Nobel Peace Prize. (ABC News)