For many years Ms Jagger campaigned to stop the genocide taking place in Bosnia and, later, to make the perpetrators accountable before the International Criminal Tribunal for the former Yugoslavia (ICTY).
She testified on this issue before the Helsinki Commission on Human Rights, the United States Congressional Human Rights Caucus, the International Operations Subcommittee on Human Rights, and the British and European Parliaments.
She won an academic scholarship to study political science at the Institute of Political Science in Paris, France.
It was there that she discovered the value of freedom and democracy, the rule of law, judicial review, habeas corpus and respect for human rights - concepts she had only dreamt about in Nicaragua. On Christmas Eve in 1972, she heard on the news that there had been a devastating earthquake in Managua, Nicaragua.
In July 1995, when the United Nations “safe area” of Srebrenica was overrun by Bosnian Serb troops, some 8,000 civilians, virtually the entire male population, were systematically massacred. Jagger wrote a decisive essay: ‘J’accuse: the Betrayal of Srebrenica,’ a detailed account of the massacre, which was published world-wide.