This paper draws on the insights of Marxism to outline a critical alternative course on public international law. It explains inter alia the changes in the doctrines and rules of international law by linking them to extra-textual realities. It contends that the character of contemporary international law is being transformed from bourgeois democratic international law to a bourgeois imperial international law. It sustains this conclusion by looking at certain developments in the world of international law in recent years. However, the outline offered is not exhaustive in terms of either the subjects considered or their analysis.