 Complete the following phrase:  Population transfer in the Soviet Union  was the forced transfer by the Soviet government of various groups from 1930 up to 1952 ordered by Soviet leader Joseph Stalin and executed by the NKVD official Lavrentiy Beria. It may be classified into the following broad categories: deportations of anti-Soviet categories of population often classified as enemies of workers, deportations of entire nationalities, labor force transfer, and organized migrations in opposite directions to fill ethnically cleansed territories. 