1. The Kerala Public Service Commission by notification dated 18-8-1975, invited applications from qualified scheduled castes and scheduled tribes candidates for selection to the post of Deputy Superintendent of Police in the Kerala State Police Department. The petitioner submitted an application pursuant to such invitation. The recruitment was under R.17A of the Kerala State and Subordinate Services Rules. That rule provides for special recruitment from among scheduled castes and scheduled tribes candidates.

2. Pursuant to the select list prepared by the Public Service Commission, the petitioner was advised for appointment for the second vacancy. Pursuant to that the petitioner was appointed as Deputy Superintendent of Police and he joined duty on probation on 11-3-1976 While so, on 30-3-1976, the first respondent, Kerala Public Service Commission, issued a notice to the petitioner calling upon him to show cause why the advice tendered by the Commission for his appointment should not be cancelled under R.3(c) of the Kerala State and Subordinate Services Rules and further why he should not be permanently debarred from recruitment by the Public Service Commission. The pet