I really have a hard time understanding it. Before Karl Marx complain that workers should get full benefit of their labor rather than having to share it with politicians and land owners.
Contemporary capitalistic society is close to that. Look at Mark Zukenberg. He started as a poor student and become billionaires by working on his start up. That seems like pretty pro workers system to me.
Capital owners that buy Mark stocks actually lost money. Capital owners have to take huge risk or accept very low return now due to abundance of capital. Capitalism is ironically far more friendly to workers than capital owners.