This book fills a significant gap in the study of the establishment of communist rule in Poland in the key period of 1944-1950. It shows that nationalism and nationality policy were fundamentally important in the consolidation of communist rule, acting as a crucial nexus through which different groups were both coerced and were able to consent to the new unfolding social and political order. Drawing on extensive archival research, including national and regional archives in Poland, it provides a detailed and nuanced understanding of the early years of communist rule in Poland. It shows how after the war the communist Polish Workers Party (PPR) was able to redirect widespread anger resulting from the actions of the NKVD, Soviet Army and the communists to more of 1947-48, and the arrival of Greek refugees in Poland in the period 1948-1950.