Stalin’s economic policies of late 1920s and 1930s were harsh. The proponents, however, point out to the rapid growth in 1928-1940 and to the fast reallocation of labor from agriculture to non-agriculture. This view holds that, although excessively brutal, Stalin’s policies allowed Russia to develop a strong modern economy that sustained a successful war effort in 1941-1945 and propelled Russia into a position of a dominant power after WWII.
From Cheremukhin, Golosov, Guriev, Tsyvinski. They estimate a model and conclude:
Stalin’s policies led to the short run costs (1928-1940) amounting to astonishing 24.1 percent of consumption. However, in the long run the generation born in 1940 reaps the benefits of the reduction of frictions and yields a 16.5 percent lifetime gain.