Require the attendance before the Commission of any person; Require the production of any books, papers or documents; Inspect any books, papers, materials or documents produced before it or otherwise and; Retain any such books, papers, materials, or documents for such reasonable period as the Commission deem fit; Make copies of any of them, or their contents; Require any person to make oath or affirmation to answer truthfully all questions put by member s of the Commission relating to any matter being inquired into by the Commission; Require any person appearing before the Commission, including the person whose conduct is subject to an inquiry, whether summoned to appear or not, to answer any question put by any member of the Commission, or by any other person appearing before the Commission.