This is an article by Friedrich Engels:
Social Classes — Necessary and Superfluous
In it, Engels explains how bourgeoisie is becoming a superfluous class which is not needed by society, just as "a territorial aristocracy was an unavoidable and necessary element of society" but became useless and turned into a parasite over time. While capitalism was necessary and progressive for some time in history, it has become a hinder for progress over time.
There was time when a capitalist was the employer and manager, but now, a modern capitalist never bothers to visit the factories or interfere with the production or service. He just sits and collects the profits. The only thing which interests him is moving his capital where the profits are the highest.
Those who actually manage the production are educated employees who are trained for their jobs. Even now, the worker class is managing the economy, although in favor of capitalists and with the purpose of maximizing their profits, in competition with other producers and without a central plan.
Removing capitalists from power may sound blasphemous, but only as much as removing feudal land lords or slavers from power sounded blasphemous long ago.