There is nothing missing from the thesis statement, it's fine as is.
The missing statement refers to statements that lack any verb, noun, pronoun, adjectives, or adverb. It means the linkage between subject and predicate that makes the sentence unclear to comprehend.
Therefore, in the above sentence, no word seems to be missed as the sentence is giving clear menaing that Martin Luther followed the same principle of non-violence as Gandhiji in protesting for Civil rights.
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