But he did write quite extensively on Lumpenproletariat.

vagabonds, discharged soldiers, discharged convicts, runaway galley slaves, swindlers, charlatans, pickpockets, tricksters, gamblers, procurers, brothel keepers, porters, intellectuals, organ grinders, rag-pickers, knife-grinders, tinkers, beggars; in short, the entirely undefined, disintegrating mass, thrown hither and yon, which the French call la bohème.

That is quite a few groups he considered subhuman, where half the ‘cleansing’ operations under communism have derived their theoretical excuses from.