The Council may, without notice, cause the affairs of any department or the conduct of any officer or employee to be examined. Any person or persons appointed by the Council to examine the affairs of any department or the conduct of any officer or employee, shall have the same power to compel the attendance of witnesses, and the production of books and papers and other evidence, and to cause witnesses to be punished for contempt, as is conferred upon the Mayor, Council or committee thereof by this Charter or by law.