Section 21

Where any civil proceedings against the Federal Government are instituted, an application may at any stage of the proceedings be made to the court by or on behalf of the Attorney General to have the Government of such State as may be specified in the application substituted for or joined with the Federal Government as defendant to the proceedings.

Upon any such application as is mentioned in the last preceding subsection or in subsection 22(2) the court may if it thinks fit make an order granting the application on such terms as the court thinks just; and on such an order being made the proceedings shall continue as if they had been commenced against the Government specified in that behalf in the order.

Parties to proceedings by and against a State Government