Section 2. The superintendent and the deputy of each correctional institution of the commonwealth shall be appointed by the commissioner, shall hold office during his pleasure, and shall not be subject to the provisions of sections nine A and nine B of chapter thirty, or chapter thirty-one.
Each superintendent shall, before entering on the performance of his official duties, give bond to the commonwealth, in such sum as the comptroller may prescribe, with sureties approved by the commissioner, conditioned faithfully to perform the duties of his office. The approval of the sureties shall be endorsed on the bond, and it shall be filed with the state treasurer.