He attempted to “cleanse” the country and it resulted in the death of an estimated 1.7 to 2.5 million people.
There was an interesting policy going around called agrarian collectivization which he put into practice in the late 1970’s.
Breakdown: Forced city folk to relocate to farms and forced them into hard labor.
His underlying reason was that it would scare people into believing he was telling the truth.
Pol didn’t stop at enslaving his own people though.