I’m not familiar with the incident with Khrushchev, but the others didn’t just kill the anarchists for no reason. Each leader was faced with an incredibly unstable country and economy. Anarchists hate government. So naturally, they’ll join with the other leftists to take down the government. But, once the revolution is over, it’s time to reorganize and reestablish a government. As I said though, anarchists hate government. So, they continue to destabilize and fight against the government, even though the new government is trying to reorganize and develop a stable economy.

Each groups was told to stand down and join in rebuilding the their respective countries or risk causing more widespread famine and throw the country into… Well anarchy. The problem isn’t that these leaders are necessarily evil men for what they did to the anarchists. The problem is the dangers that the anarchists created for the people of China and the Soviet Union. This is why Anarchism has never succeeded on a large scale. It’s only good at disruption and destruction. Read about Spain in the late 19th century for examples. No country can survive under constant revolution.