539 as may be specified in the order; * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * (4) If it appears to the Central Government or the State Government that in the interests of the defence of India and Civil defence, or the efficient conduct of military operations, or for maintaining supplies and services essential to the life of the community, it is necessary to exercise control over the whole or any part of an existing undertaking, that Government may by order authorise any person (hereinafter referred to as an authorized controller) to exercise, with respect to the undertaking or any part thereof specified in the order, such functions of control as may be provided by the order; and so long as an order made under this sub rule is in force with respect to any undertaking or part of an undertaking (a) the authorised controller shall exercise his functions in accordance with any instructions given to him by the Central Government or the State Government, so, however, that he shall not have power to give any directions inconsistent with the provisions of any Act or other instrument determining the functioning of the undertakers except in so far as may be specifically provided by the order; and (b) the undertaking or part shall be carried on in accordance with any directions given by the authorised controller in accordance with the provisions of the order, and any person having any function of management in relation to the undertaking or part shall comply with any such directions; (5) The Central Government, so far as it appears to it to be necessary or expedient for securing the defence of India and civil defence or the efficient conduct of military 540 operations, or for maintaining supplies and services essential to the life of the community, may direct the employment of persons subject to the or the , or the (a) in any public utility service as defined in section 2 of the , or (b) in any undertaking or part thereof, (i) which is being carried on by the Central or a State Government, or (ii) which in the opinion of the Central Government is engaged in any trade or business essential to the life of the community, or (iii) with respect to which an order made under subrule (4) is in force.