(1) The commission, the manager, or any person or committee authorized by either of them shall have power to inquire into the conduct of any department or office of the municipality 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.
(2) It shall be the duty of the manager to designate a police officer to serve subpoenas. The commission shall provide by ordinance the penalty or penalties for contempt in refusing to obey any such subpoena or to produce such books, papers, and other evidence and shall have the power to punish any such contempt in the manner provided by ordinance.