From 1929 to 1933, the Soviet Union launched a large-scale "socialist transformation movement" to unite individual small-scale peasant economies into a large collective economy, which was called "agricultural collectivization". During the period of 1927- 1928, farmers were not in a hurry to sell grain, so there was a shortage of grain. Stalin believed that the cause of the crisis was the deliberate destruction of "rich peasants". Despite the opposition of Bukharin and others, on the one hand, he used special means to crack down on "rich peasants" and forced them to sell surplus grain at the prescribed price; On the other hand, implement the policy of agricultural collectivization and destroy the individual small-scale peasant economy that hinders "socialist industrialization" and "public ownership economy"