The City Council or, when authorized by ordinance, any subcommittee of the Council, Board, Commission or Committee, shall have the power to subpoena witnesses, take testimony under oath and require the production of records by subpoena. Every elected officer, every department head and every member of any such Board, Commission or Committee, when authorized by such Board, Commission or Committee, shall have the power to administer oaths and affirmations. The Chief of Police must, on request of any such body, detail a police officer or officers to serve such subpoena. Any person so subpoenaed who neglects or refuses to appear, to produce any records or refuses to testify or answer any question, which a majority of such body shall decide to be proper and pertinent, shall be subject to contempt proceedings brought in accordance with the general laws of the State.