The Commission, or any person or committee authorized by it for the purpose, shall have power to inquire into the conduct of any department, office or officer of the city and to make investigations as to municipal affairs, and for that purpose may subpoena witnesses, administer oaths, and compel the production of books, papers and other evidence. Failure on the part of any officer of the city to obey such subpoena or to produce books, papers, or other evidence as ordered under the provision of this section shall constitute misconduct in office. If such failure shall be on the part of any employee of the city, the same shall constitute a misdemeanor.