I ask again, does anyone has a quote on that?
I read the capital, the manifesto, the Feuerbach thesen and the 18the brumaire of Luis Bonaparte in German original and can't recall what you propose. But there are lots of other texts, so if what you say is source based, I am pleased to learn.
"Lumpen" is German for rags, meaning the poorest of the poor, I can't imagine him using that for managers and the like, in another way than sarcastic. It would absolutely not fit into his theory of society.