The Department, through appropriate divisions, subdivisions and offices, shall have the power to perform and shall be responsible for the performance of all the powers, duties and functions vested by law in the Department of Labor and Industrial Relations, Employment Security Commission of Delaware, State Mediation Services, State Apprenticeship and Training Council, Industrial Accident Board and State Board for Vocational Education/Rehabilitation Division immediately prior to the effective date of this chapter and which are not otherwise specifically transferred to the Department by this chapter, excepting only those powers, duties and functions expressly vested in or retained by any such person, department, board, commission or agency.