The Registrar shall cancel the registration of a Union-
(a) if, after holding such inquiry, if any, as he deems fit he is satisfied-
(i) that it was registered under mistake, misrepresentation or fraud; or
(ii) that the membership of the Union has for a continuous period of three months fallen below the minimum required under section 9D for its registration:
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Provided that where a strike or a closure not being an illegal strike or closure under this Act in a unit of industry involving more than one-third of the workmen in the unit of the industry has extended to a period exceeding fourteen days in any calendar month, such month shall be excluded in computing the said period of three months:
Provided further that the registration of a Union shall not be cancelled under the provisions of this sub-clause unless its membership at the time of the cancellation is less than such minimum; or
(iii) that the registered Union is being conducted not bona fide in the interests of workmen but in the interests of employers to the prejudice of the interests of workmen; or
(iv) that it has instigated, aided or assisted the commencement or continuance of an illegal strike;
(b) if its registration under the Indian Trade Unions Act, 1926 (Central Act XVI of 1926) is cancelled.