50. Power to exempt in certain cases. - If the Central Government is of opinion that it is necessary or expedient in the interests of the general public so to do, it may, by order and subject to such conditions as may be specified in the order, exempt any person or association or organisation (not being a political party), or any individual (not being a candidate for election) from the operation of all or any of the provisions of this Act and may, as often as may be necessary, revoke or modify such order.