1. No person shall be held in slavery or servitude.
2. No person shall be required to perform forced or compulsory labour.
3. For the purposes of this Article the term "forced or compulsory labour" shall not include -
(a) any work required to be done in the ordinary course of detention imposed according to the provisions of Article 11 or during conditional release from such detention;
(b) any service of a military character if imposed or, in case of conscientious objectors, subject to their recognition by a law, service exacted instead of compulsory military service;
(c) any service exacted in case of an emergency or calamity threatening the life or well-being of the inhabitants.