Add on the Beligians in the Congo in the 19th century, the English in India that period as well. There's a great book called Late Victorian Holocausts that details many of these events. Colonialism in the 19th and 20th century could easily be considered "capitalist" murder and would faaar outstrip any "deaths attributed to communism."

There's also the authoritarian element that I've been thinking about lately. Right-wingers love to say socialism is inherently authoritarian and have a myriad of true examples, but we never talk about capitalism that way. Pinochet was a hyper-capitalist dictator with a secret police as brutal as any communist regime. Same goes for Franco, Suharto, and any other right-wing dictator that allows western corporations to pillage his own land. They're authoritarian as f*** but we never make a larger capitalist critique because of it.

Obviously, because we live in such a propagandized world and the language of class and exploitation needs to be beaten out of and hidden from the working class being beaten and exploited.