No person shall be excused from testifying or producing any book, document or paper in any investigation or inquiry by or upon hearing before the Commission, or any member or examiner thereof, upon the ground that the testimony, evidence, book, document or paper required of such person may tend to incriminate such person or subject such person to penalty, or forfeiture, but no person shall be prosecuted, punished, or subjected to any penalty or forfeiture for or on account of any act, transaction, matter or thing concerning which he shall, under oath, have testified or produced incriminating evidence. No person so testifying shall be exempt from prosecution or punishment for any perjury committed by such person in his testimony. Nothing contained in this section is intended to give, or shall be construed in any manner to give any corporation immunity of any kind.