It assumes the character of class struggles on an ever higher scale.
These groups become sects, cults, partisan movements, class struggles.
The history of all hitherto existing society is the history of class struggles.
First, that class divisions and class struggles arise out of the economic life of society.
Hence it is clear the doctrine of class struggles is a key to past history.
We can do the same with the class struggles of the ancient world but with less clearness.