With the rise of Communism and socialism in the early twentieth century, which started with the Bolshevik Revolution in 1917 in Russia, estimates are that over 100 million people have been murdered.
Here are the key communist and socialist dictators who caused the deaths of millions of people: Joseph Stalin; Adolf Hitler; Mao Tse Tung; Pol Pot; Idi Amin, et al.
One of the tactics used by Mao in China was to turn children against their parents, because they accepted and believed in communism. This is the reason that students are targeted for indoctrination.
Even today, innocent people suffer under communism and socialism. Exhibits A and B are North Korea and Venezuela.
This is why we fight against any attempt to implement Communism, socialism, Marxism (which formed the basis for Communism) here in the United States, which includes Critical Race Theory.