Constitution of India, 1949
218.Power to make regulations as to conditions of service of members and staff of the Commission.-
In the case of the Union Commission or a Joint Commission, the President and, in the case of a State Commission, the Governor of the State may by regulations-
(a) determine the, number of members of the Commission and their conditions of service; and
(b) make provision with respect to the number of members of the staff of the commission and their conditions of service:
Provided that the conditions of service of a member of a Public Service Commission shall not be varied to his disadvantage after his appointment.