(1) A person commits an offence if—
(a) the person holds another person in slavery or servitude and the
circumstances are such that the person knows or ought to know that the
other person is held in slavery or servitude, or
(b) the person requires another person to perform forced or compulsory
labour and the circumstances are such that the person knows or ought
to know that the other person is being required to perform forced or
compulsory labour.