The USSR allied with the US, the UK, and Western Europe during WWII. They killed more fascists than any nation.

You and I don't know everything - that's impossible, but NATO/the US subdued every leftwing movement in Europe. Globally, socialism and communism were on the rise because the working class wanted freedom, but Operation Gladio killed the movement in Europe, and the Cold War exterminated it worldwide.

Stalin supported some of these movements, but he wasn't ethical in the slightest. Unfortunately, the US upped the ante, overthrowing leaders and murdering millions. The Jakarta Method explains the US blueprint.

All of this information is de-classified, so you don't have to take my word for it. I don't support the Russian, Chinese, or the US government, but I advocate for the working people globally.