6. Statements made by persons to the Commission.- No statement made by a, person in the course of giving evidence before the Commission shall subject him to, or be used against him in, any civil or criminal proceeding except a prosecution for giving false evidence by such statement: Provided that the statement- (a) is made in reply to a question which he is required by the Commission to answer, or
(b) is relevant to the subject matter of the inquiry.
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