[narag]

Please do elaborate.

This one is well known and profusely commented, I'm sure you can google it: Marx considered industrial workers the ones with more class awareness and predicted that Socialism will ignite in the UK first.

On the contrary, it succeeded in big old agrarian countries like Russia and China.

Also predicted that worker class solidarity will make for an idilic proletary dictatorship, no need for democratic checks and balances that only decadent burgeois countries need.

Then came Lenin, Stalin, Mao...