Federal Constitution NOTES Art. 6 Clause (3) The present Clause was inserted by Act A1130, section 2, in force from 28-09-2001, and replaced the earlier Clause which read as follows: “(3) Work incidental to the serving of a sentence of imprisonment imposed by a court of law shall not be taken to be forced labour within the meaning of this Article.”. Clause (4) Added by Act A354, section 5, in force from 27-08-1976.