Nelson Mandela was the president of South Africa from 1994 to 1999. His government helped to stop apartheid (the dividing of people by their race). For this he was awarded the Nobel Peace Prize in 1993 after which he became the president..
Bob Brown is a former Australian political party leader. He is a hero because he was the first openly gay politician in Australian politics, he saved Tasmania's forests and he stands up for asylum seeker's rights.