Singh, J.

This is a petition under Article 226 of the Constitution praying that the order of the Industrial Court passed on September 29, 1967 be quashed and that a writ in the nature of mandamus be issued directing the said Court to implead the Petitioner and Respondents Nos. 4 to 7 as parties in a reference pending in that Court.

The relevant facts are that the Motor Karmachari Sangh Dhar, which is a representative union of workers of employees employed by the Madhya Pradesh State Road Transport Corporation in the Dhar district of the State, referred for arbitration to the Industrial Court an industrial dispute relating to payment of dearness allowance by the Corporation. This reference was made under Section 52 of the Madhya Pradesh Industrial Relations Act, 1960 and is still pending. The Corporation raised an objection that the representative union of workers of Dhar area which could not represent workers of other areas in the State was not competent to refer the dispute of dearness allowance as it concerned the workers employed by the Corporation in all the areas of the State. The representative unions of workers of Ujjain, Mandsaur, Shivpuri, Khandwa and Barwani then appli