Conn. Gen. Stat. § 31-7
The orders and notices given by the Labor Commissioner under the provisions of this chapter shall be written or printed, signed by him officially, and may be served by him or any proper officer or indifferent person, by leaving an attested copy thereof with or at the usual place of abode of the person upon whom service is to be made, or by registered or certified mail addressed to such person at his last-known place of address. Such notice, properly endorsed with the doings of the person or officer serving the same, shall be returned to the commissioner and shall be prima facie evidence that notice was given as therein appears. Notice to one member of a firm shall be notice to every member thereof, and notice to the president, secretary or treasurer of a corporation shall be notice to such corporation. The fees for serving such orders and notices, unless served by the commissioner, shall be the same as for the service of process in civil actions, and shall be included in the necessary expenses of the commissioner.
Conn. Gen. Stat. § 31-7
(1949 Rev., S. 3756.)