This book seeks to understand how and why we should hold leaders responsible for the collective mass atrocities that are committed in times of conflict. It attempts to untangle the debates on modes of liability in international criminal law (ICL) that have become truly complex over the last twenty years, and to provide a way to identify the most appropriate model for leadership liability. A unique comparative theory of ICL is offered, which clarifies the way in which ICL develops as a patchwork of different domestic criminal law notions. This theory forms the basis for the comparison of some...