Afaik it was not "planned" unlike Stalin and Beria's NKVD - Mao ordered crows killed to increase crop yields not thinking about the consequences of remove a predator from an ecosystem because the smart folks were either ignorant or afraid of going to a re-education camp.

Mass starvation.

Under Mao's rule, millions of people were overtly executed. It wasn't just Mao's incompetence that got people killed accidentally. He ordered millions of people to be murdered.

do you have reference for this? I am Chinese and would like to learn.

The Cultural Revolution.

Mao killed people for mistakes far less than that, didn't he.