In an Industrial undertaking a few registered unions are in existance. One who got the majority is recognised by the management and negotiate with them. Under the provisions of Trade Union Act 1926, every union is submitting the annual return to the registrar of Unions. There is no provision of giving copy of the return to the employer. The only basis of ascertaining the number of membership is the check-off system (only for the majority Union)by which individual employee gives authorisation to deduct the membership fee from salary. On a later date it was found that each Union is showing their membership in the annual return that sum total of all members is much higher than the total employees of the establishment. This reveals that either there are same person becomes members of more than Union or the figure given in the annual return is not correct. In this situation, dispute may be raised to know which one is a majority Union for which REFETRENDUM may be one way to be initiated by the labour authority. But if referendum is adopted than,it may leads to industrial unrest and loss of production ect. In such situation, What should be done by the Employer?