There shall be, in the Labor Department, a Board of Mediation and Arbitration, consisting of two panels of three members each. One member of each panel of said board shall represent employers of labor, one shall represent employees and one shall represent the public in general. No such public member shall have been the representative of any employer or employee in a labor dispute during the five years immediately preceding the year of his appointment. One of the public members of said board shall be the chairman. Each member representing employees shall be a member of a bona fide labor organization, which may be either a national or an independent organization, but said two board members shall not be members of the same labor organization. On or before July fifteenth in the odd-numbered years, the Governor shall appoint two members of said board to succeed the members whose terms expire. The term of office for the members of said board shall be six years. The members so appointed shall have power to complete any matter pending at the expiration of the terms for which they were appointed. The board shall choose a public member as deputy chairman to serve in case of the death, removal, incapacity or absence of the chairman. Any vacancy in the membership of said board shall be filled by the Governor for the unexpired portion of the term. Any member of the board may be removed by the Governor for cause or for the good of the service, but only after notice and public hearing upon charges preferred and subject to the right of appeal to the Superior Court. A vacancy in the membership for any cause shall be filled by the Governor within thirty days of the date of its occurrence.