13. (1) Every citizen not below 21 years of age shall have the right to vote at any election to the Legislature of the Union and of any unit thereof, or, where the Legislature is bicameral, to the lower chamber of the Legislature, subject to such disqualifications on the ground of mental incapacity, corrupt practice or crime as may be imposed, and subject to such qualifications relating to residence within the appropriate constituency, as may be required, by or under the law.
(2) The law shall provide for free and secret voting and for periodical elections to the Legislature.
(3) The superintendence, direction and control of all elections to the Legislature whether of the Union or of a unit, including the appointment of Election Tribunals, shall be vested in an Election Commission for the Union or the unit, as the case may be, appointed, in all cases, in accordance with the law of the Union.