A commissioner of an authority may be removed by the appointing power for inefficiency, neglect of duty or misconduct in office, but a commissioner shall be removed only after opportunity to be heard in person or by counsel before the appointing power, at least ten days prior to which he shall have been given a copy of the charges against him. In the event of the removal of any commissioner, a record of the proceedings, together with the charges and findings thereon, shall be filed in the office of the clerk. Such appointing power, for its purposes under this section, may subpoena any books, papers, records, accounts, contracts, deeds, regulations or documents. Any person who wilfully refuses to produce such books, papers, records, accounts, contracts or documents shall be fined not more than five hundred dollars or imprisoned not more than six months or both.