The theory behind collectivization included not only that it would be socialist instead of capitalist but also that it would replace the small-scale unmechanized and inefficient farms that were then commonplace in the Soviet Union with large-scale mechanized farms that would produce food far more efficiently. Lenin saw private farming as a source of capitalist mentalities and hoped to replace farms with either "sovkhozy" which would make the farmers "proletarian" workers or "kolkhozy" which would at least be collective. However, most observers say that despite isolated successes, collective farms and sovkhozes were inefficient, the agricultural sector being weak throughout the history of the Soviet Union.