Section 10
SEC. 10. Upon any investigation or proceeding for violation of this Act no person shall be excused from giving testimony upon the ground that such testimony would tend to convict him of a crime, but such testimony can not be received against him upon any criminal investigation or proceeding: Provided, however, That no person so testifying shall be exempt from prosecution or punishment for perjury committed in the course of any proceeding or investigation had by virtue of this Act.