Class struggle is class conflict looked at from a Marxist perspective. In Marxist theory, "The history of all hitherto existing society is the history of class struggle", Karl Marx, Communist Manifesto, 1848.
... Neolithic Stone Age. Flint implements, exactly like those of Siberia and Russia, have been found at Dui and Kusunai in great numbers, as well as polished stone hatchets, ...