Please let’s not use GQ for political posturing that wrenches history out of all understanding.
Marx took a specific problem, the rapid industrialization of Europe in general and Britain in particular, saw some real and overwhelming evils, and postulated a general solution.
With hindsight, we can see that the general solution would not have worked and that it was applied in times and places outside of the original. But the problem was very real. It was solved only through government action, which Marx believed was an impossibly - quite true in the monarchies of Europe of his time.
In the very long term, capitalism has created middle classes and this was the solution to the problem Marx was facing. He could not have foreseen this, because nobody foresaw this. And it wouldn’t have pleased him to learn that even in the best of all examples, the U.S., it would take a full century for the solution to come to pass.
It is a given that Marx’s writings have been abused, both by those who took action in his name, and by those who took actions against his name. But the problems he railed against were vital and deserving to be denounced in the strongest of terms, and serious people could seriously cite him as a possible solution until World War II, when the power of industrialization finally caught up with the problem of poverty.
You can’t invoke Marx’s name as a boogieman without making these distinctions. Well, you shouldn’t. People can and do all the time, but that is nothing more than heaping ignorance onto a pile of steaming lack of knowledge.
As for the OP, I believe both claims, though I can’t provide a citation. Without Marx’s critique of capitalism, you don’t have a full understanding of capitalism. He should be well and fully understood by any self-respecting CEO.
And "“From each according to his abilities, to each according to his needs,” is a phrase deliberately created to reflect Christian morality, and equally well reflects the Horatio Alger ideal of self-achievement in the U.S. With the general level of ignorance about Marx it’s not at all surprising that people don’t know the source or its context, but the sentiment is 100% American.