Lumpenproletariat / Karl Marx and Friedrich Engels

a collective term from Lumpenproletarian (a German word literally meaning "raggedy proletarian"), was first defined by Karl Marx and Friedrich Engels in The German Ideology (1845) and later elaborated on in other works by Marx. The term was originally coined by Marx to describe that layer of the working class, unlikely to ever achieve class consciousness, lost to socially useful production, and therefore of no use in revolutionary struggle or an actual impediment to the realization of a classless society
In The Eighteenth Brumaire of Louis Napoleon (1852), Marx refers to the lumpenproletariat as the "refuse of all classes", including "swindlers, confidence tricksters, brothel-keepers, rag-and-bone merchants, beggars, and other flotsam of society". In the Eighteenth Brumaire, Marx rhetorically describes the lumpenproletariat as a "class fraction" that constituted the political power base for Louis Bonaparte of France in 1848. In this sense, Marx argued that Bonaparte was able to place himself above the two main classes, the proletariat and bourgeoisie, by resorting to the 'lumpenproletariat' as an apparently independent base of power, while in fact advancing the material interests of the 'finance aristocracy'.
For rhetorical purposes, Marx identifies Louis Napoleon himself as being like a member of the lumpenproletariat, insofar as being a member of the finance aristocracy, he has no direct interest in productive enterprises. This flourish however is not meant to equate the lumpenproletariat with the general class of non-producers which includes it and the rentier class, the pure capitalists who live solely off capital, among others.