Mandela was the first black president of South Africa. He fought with no violence so that Africa was free from racist politics. He like MLK wanted black people to have equal rights. No person should be treated differently because of color.
Martin Luther King Jr. got some inspiration from Gandhi. MLK was also fighting for equal rights for black people. He did it with nonviolence. He did many big speeches, boycotts, bus sits. Him and many other did many brave things just black people could have equal rights.
Gandhi saved India from Britain's cruel unfair laws. India finally could be united without having to be controlled by Britain. Most importantly he did it with no violence what so ever. He served any sentence he got, and when he got out he just kept on fighting for the freedom India deserved.