Under what circumstances, registration of a Trade Union may be cancelled ?

Section 10 of the Trade Unions Act, 1926 states that: A certificate of registration of a Trade Union may be withdrawn or cancelled by the Registrar- on the application of the Trade Union to be verified in such manner as may be prescribed, or if the Registrar is satisfied that the certificate has been obtained by fraud or mistake, or that the Trade Union has ceased to exist or has wilfully and after notice from the Registrar contravened any provision of this Act or allowed any rule to continue in force which is inconsistent with any such provision, or has rescinded any rule providing for any matter provision for which is required by section 6: Provided that not less than two months' previous notice in writing specifying the ground on which it is proposed to withdraw or cancel the certificate shall be given by the Registrar to the Trade Union before the certificate is withdrawn or cancelled otherwise than on the application of the Trade Union.