This chapter investigates the struggle between Nationalists and Communists to punish so-called “hanjin” (literally, traitors to the Han Chinese nation) across the vast canvas of postwar East Asia. Drawing on hitherto unexamined government correspondence, legal codes, edicts, accusations, newspapers and popular literature, this chapter examines how former collaborators were brought to justice in legal and extra-legal ways. It examines the political struggles, and the tensions between justice and nationalism in the crucible of civil war. In so doing it delves into fraught categories of identity after empire, collaboration and nationalism, and postwar commemoration and memory of the so-called War of Resistance against Japan (1931-1945) in China. Ultimately this work forces us to reckon with questions of not just the meaning of “hanjian” but what the persecution of such figures reveals about the imperial roots of Modern China.