 Most of the remaining Polish population was expelled to the Polish territories gained from Germany (especially to present day Wrocław) whose German population was respectively expelled or fled in fear of Soviet retribution.Migrants from Ukrainian-speaking rural areas around the city, as well as from other parts of the Soviet Union arrived attracted by the city's rapidly growing industry requirements.This population transfer altered the traditional ethnic composition of the city, which was already drastically changed as Polish, Jewish and German population was displaced or murdered.