They set off 90 years of worldwide terror, and all because nothing was done to stop them.
A historically inaccurate statement. The British, Canadians, Italians, Americans, Japanese and even a few French all intervened in the Russian Civil War 1918 - 1920.
A quick search shows 416 Americans killed in action, 359 wounded.
Oh, plenty was done to stop them. It’s simply that the Whites and the West lost that war.