Industrial Disputes Act, 1947
(1) If at any time any Union (hereinafter in this section referred to as "applicant Union") makes an application to the Registrar for being registered in place of the Union (hereinafter in this section referred to as "representative Union") for a unit of an industry on the ground that it has a larger membership of workmen employed in such unit of the industry, the Registrar shall call upon the representative Union by a notice in writing to show cause within one month of the receipt of such notice why the applicant Union should not be registered in its place. An application made under this sub-section shall be accompanied by such fee as may be prescribed. (2) The Registrar shall forward to the Labour Commissioner of the State Government a copy of the said application and notice. (3) If, on the expiry of the period of notice under sub-section (1) and after holding such inquiry as he deems fit, the Registrar comes to the conclusion that the applicant Union complies with the conditions necessary for registration specified in section 9D and that its membership was during the whole of the period of three months immediately preceding the date of the application under this section larger than the membership of the representative Union, he shall, subject to the provisions of section 9D, register the applicant Union in place of the representative Union. (4) Every application made under this section shall be published in the prescribed manner not less than fourteen days before the expiry of the period of notice under sub-section (1).