How did social activists (M.L.K Jr, Ghandi etc) first get their voice heard?

Question: How did social activists (M!.L!.K Jr, Ghandi etc) first get their voice heard!?
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MLK was a Baptist minister, and known as an excellent orator!. Gandhi was a lawyer in South Africa and saw many injustices caused by the British, and wanted to return to his homeland and work for independence!. So he, too, had good oratory skills!. Www@QuestionHome@Com