Question: The human rights campaigner who was the subject of an unauthorized biography by Jerry Oppenheimer is the widow of what politician?
Context: Gazmend Pula (born in Pristina, Kosovo) is a Kosovar-Albanian intellectual, human rights campaigner, and is Kosovar ambassador to Albania.  He is the founder of the Kosovo Helsinki Committee for Human Rights based in Pristina, and has been active in the struggle for the advancement of political and civil liberties in Kosovo, for which he was awarded the US and EU Democracy and Civil Society Award in 1998.  In addition to his civic and political engagements, he holds a PhD in Electrical Engineering, and is the author of two books on electrical engineering.  Prior to being appointed ambassador by the President of Kosovo, he held the title of Associate Professor in the University of Pristina, Cathedra for Production and Transmission of Electrical Energy. Saumen Guha is a political activist turned human rights campaigner and author who is most famous for pursuing the case of his sister Archana Guha who was tortured by the police.  They tortured her in order to extract information on her brother's whereabouts, alleging that he was a Naxalite.  After a lengthy historic legal battle the main perpetrator was declared guilty.  A PUCL 'Journalism for Human Rights' award-winning article by Subhas Chandra Ganguly on this protracted legal battle was published in Frontier magazine in 1996, and his acceptance speech also described the case in detail. Igor Blaževič (born 1963 in Trebinje, Bosnia) is foremost European human rights campaigner of Bosnian origin living in the Czech Republic as the founder and longtime director of One World, the Europe's biggest human rights documentary International Film Festival and the director of the People in Need foundation.  He is also the member of the steering committee of World Movement for Democracy.  Currently he is active in Asia.  Among other activities he is the director of the Educational Initiatives, training program for the Burma activists based in Thailand. Ethel Skakel Kennedy (born April 11, 1928) is an American human-rights campaigner and widow of Senator Robert F. Kennedy, who was assassinated while running for nomination as Democratic presidential candidate in 1968. Viviana Elisa Díaz Caro (born October 26, 1950) is a Chilean human rights campaigner who became widely known in the struggle for human rights in Chile as the president of the "Agrupación de Familiars de Detenidos Desaparecidos" (Association of the Relatives of the Disappeared).  She is the daughter of Víctor Días sub-secretary of the Communist Party of Chile who disappeared after he was arrested by security forces in 1976. Hafez Abu Seada is an Egyptian politician, human rights activist and the current Chairman of the Egyptian Organization for Human rights Egypt's oldest Human Rights NGO , most known for his campaigns against torture and police brutality in Egypt.  Abu Seada was born in 1965 in Cairo Egypt.  He took part in the student movement of the 1980s against president Mubarak's government and was detained several times due to his dissident activities.  After graduating from law school he worked as a human rights lawyer and got involved in Egyptian civil society.  Throughout his human rights career he held many posts including the presidency of the Egyptian Organization for human Rights.  He was also appointed in the mid 2000s in the government formed Egyptian National or Human Rights, and is a member of International Federation for Human Rights and was its envoy to the Arab league from 2004 to 2007.  Abu Seada took part in dozens of international human rights conferences, as well as attending the United Nations Human Rights council sessions in Geneva regularly representing the Egyptian Organization for Human Rights which has a consultative status with the UN that gives it the right to observe various UN sessions.  Abu Seada was a vocal supporter of Egypt's 2011 Revolution against the Mubarak regime, and took part in the street protests that ousted Egypt's longtime dictator, Abu Seada also harshly opposed the Muslim Brotherhood's regime and took part in the June 2013 uprising that ultimately led to the deposing of president Morsi on July 3, 2013.  Abu Seada ran in Egypt's 2015 parliamentary elections, he nominated himself in the Maadi electoral district as a candidate of the conservative party.  He pledged that the preservation of human rights and freedom of expression will be on the top of his legislative agenda if elected.  Abu Seada's strongest opponents in the elections were Hussein Megawer a leading figure of Mubarak's defunct National Democratic Party and a former member of parliament, and Gamal El Sherif a well known lawyer.  Abu Seada came in third in the polls, losing in the first round, while El Sherif defeated Megawer in the runoffs by a landslide.  Abu Seada attained a PHD in international law from Alexandria University in 2017, and remains one of the vocal defenders of human rights in Egypt despite a massive government crackdown on civil society. Ruth Margaret Adler nee Oppenheimer (1944–1994) was a feminist, human rights campaigner and child welfare advocate.  She was founder of Amnesty International's Scotland office as their first employee in Scotland in 1991.  She was a founding member of Scottish Women’s Aid in 1974, a member of the Lothian Region Children’s Panel and she helped to establish the Scottish Child Law Centre. Jerry Oppenheimer is an American author who has written several unauthorized biographies of public figures including Hillary and Bill Clinton, Anna Wintour, Rock Hudson, Martha Stewart, Barbara Walters, Ethel Kennedy, Jerry Seinfeld and the Hilton family. Elizardo Sánchez Santa-Cruz (born 1944) is a Cuban human rights campaigner and founder of the "Cuban Human Rights and National Reconciliation Commission", a group supporting change in Cuba. Sunila Abeysekera (1952 – September 9, 2013) was a Sri Lankan award-winning human rights campaigner.  She worked on women's rights and human rights issues in Sri Lanka and in the South Asia region for over 20 years as an activist and scholar.  UN Secretary-General Kofi Annan presented Abeysekera with a United Nations Human Rights Award in 1999.  She was also honoured for her work by Human Rights Watch.
Answer: Robert F. Kennedy