§ 20. Divisions or bureaus. Existing divisions or bureaus in the department shall continue until changed, consolidated or abolished pursuant to this section. The commissioner may establish such divisions or bureaus as may be necessary for the administration and operation of the department, under this chapter, and may change, consolidate or abolish divisions or bureaus. Each division and bureau shall be subject to the supervision and direction of the commissioner, and shall have jurisdiction of such matters, exercise such powers and perform such duties as may be assigned to it by the commissioner.