Why did the transition to collectivization result in widespread starvation?

The transition to collectivization in the former Soviet Union caused widespread starvation, because there was a sudden disruption of production which happened because of collective farming and the mass seizure of property. Many of the land had become infertile, because of recent industrial developments and since it was a forced collectivization and completely controlled by the government, the people would receive as much money as they would produce. Of course this was impossible if their land was not fertile. 

North korea has been ruled by dictator since 1948