Shortly before, during, and immediately after World War II, Stalin conducted a broad-scale series of deportations that profoundly affected the ethnic map of the Soviet Union. Separatism, resistance to Soviet rule, and collaboration with the invading Germans were cited as the official reasons for the deportations. Individual circumstances of those spending time in German-occupied territories were not examined. After the brief Nazi occupation of the Caucasus, the entire population of five of the small highland peoples and the Crimean Tatars—more than a million people in total—were deported without notice or any opportunity to take their possessions.