The Soviet Union introduced collectivization of its agricultural sector between 1928 and 1940. It began during and was part of the first five-year plan. The policy aimed to integrate individual landholdings and labour into nominally collectively-controlled and openly or directly state-controlled farms: Kolkhozes and Sovkhozes accordingly. The Soviet leadership confidently expected that the replacement of individual peasant farms by collective ones would immediately increase the food supply for the urban population, the supply of raw materials for the processing industry, and agricultural exports via state-imposed quotas on individuals working on collective farms. Planners regarded collectivization as the solution to the crisis of agricultural distribution that had developed from 1927. This problem became more severe as the Soviet Union pressed ahead with its ambitious industrialization program, meaning that more food would be needed to keep up with urban demand.