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FILE - In this May 18, 2009 file photo, Caroline Kennedy, president of the Kennedy Library Foundation, left, stands with Liberian peace activist Leymah Gbowee after Gbowee was awarded the John F. Kennedy Profile in Courage Award at the John F. Kennedy Presidential Library and Museum, in Boston. 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/Lisa Poole, 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)