International criminal law — Offences against humanity — International Convention to Suppress the Slave Trade and Slavery, 1926 — Slavery — Definition — Definition of slavery in Australian Criminal Code (Cth) deriving from definition in Article 1 of Convention — Whether respondent possessing and using complainants as slaves — Whether proof of intention required — Sections 270.1 and 270.3(1)(a) of Code — Meaning and constitutional validity — Convictions in Australia of slavery offences contrary to Section 270.3(1)(a) of Code — Provisions in Chapter 8 of Code dealing with offences against humanity

Relationship of international law and municipal law — Treaties — Effect in municipal law — International Convention to Suppress the Slave Trade and Slavery, 1926 — Sections 270.1 and 270.3(1)(a) of Australian Criminal Code (Cth) — Construction and application of Code — Relevant provisions introducing into Australian municipal law offences deriving from 1926 Slavery Convention — Constitutional validity of Sections 270.1 and 270.3(1)(a) of Code — The law of Australia