The Council may subpoena witnesses, administer oaths and compel the production of books, papers and other evidences needed to compel formal investigation into the conduct of any department, office or officer of the City, and may make investigations as to malfeasance, misfeasance, nonfeasance or irregularities in Municipal affairs. Failure to obey such subpoena or to produce books, papers or other evidence as ordered under the provisions of this section shall constitute misconduct in office.