4. (1) The Government may, at any time, by notification in the official Gazette,-(a) revoke a licence granted to a trade organisation ¹[after giving the trade organisation an opportunity of being heard];(b) declare that all licences granted before the 19th February, 1959, shall stand revoked on the date specified therein; and(c) cancel any exemption granted under sub-section (6) of section 3 ²[after giving the trade organisation an opportunity of being heard]. (2) Upon the cancellation of exemption under clause (c) of sub-section (1) or upon the expiry of the period for which exemption was granted, the trade organisation concerned may within thirty days of such cancellation or expiry, apply for a licence.