In this and the next episode of A Century on Film, we explore the dimensions of a global tragedy that reverberates today. Our first images of refugees date from late in World War I. Armenians flee the Ottoman Empire as it teeters on the brink of collapse. We look back at Russian refugees in 1921, displaced Poles in 1941, and the conflict between Croats and Serbs in World War II, including footage of Croats rounding up Serb civilians after their leader meets Hitler. We also trace the fate of Jews in Europe and Palestine from the 1920's to 1930's.