Opportunity should be given.- An action taken without giving show cause notice cannot be sustained

(1) If the Collector has reason to believe that any persons are in unauthorised occupation of any public premises, the Collector or any other officer authorised by him in this behalf may require those persons or any other person to furnish information relating to names and other particulars of the persons in occupation of the public premises and every person so required shall be bound to furnish the information of possession!