Trade Union Act, 1926
4. Mode of registration
10 [(1) Any seven or more members of a trade union may, by subscribing their names to the rules of the trade union and by otherwise complying with the provisions of this Act with respect to registration, apply for registration of the trade union under this Act.
13 [(2) Where an application has been made under sub-section (1) for the registration of a trade union, such application shall not be deemed to have become invalid merely by reason of the fact that, at any time after the date of the application, but before the registration of the trade union, some of the applicants, but not exceeding half of the total number of persons who made the application, have ceased to be members of the trade union or have given notice in writing to the Registrar dissociating themselves from the application.]