Damnatio memoriae. Literally "condemning the memory".
The phrased was not used in Roman times, it dates form the 1600s, but the idea was there. After a king or an emperor died, they could be erased from history. Their names chiseled off the memorials, all mention of their name forbidden, their tomb eliminated. It was not uncommon in Rome for the incoming emperor to do it to his predecessor.
Stalin did it to Trotsky and others.
The Taliban did to the Buddha status in 2017.
Now we are going to do it. Once we get started it will be easy. The hard part will be stopping.