Lumpenproletariat is a term that was originally coined by Karl Marx to describe the layer of the working class that is unlikely ever to achieve class consciousness and is therefore lost to socially useful production, of no use to the revolutionary struggle, and perhaps even an impediment to the realization of a classless society. The word is derived from the German word Lumpenproletarier, "Lumpen" literally meaning "miscreant" as well as "rag". The Marxist Internet Archive writes that "[lumpenproletariat] identifies the class of outcast, degenerated and submerged elements that make up a section of the population of industrial centers" which include "beggars, prostitutes, gangsters, racketeers, swindlers, petty criminals, tramps, chronic unemployed or unemployables, persons who have been cast out by industry, and all sorts of declassed, degraded or degenerated elements."
In The Eighteenth Brumaire of Louis Napoleon (1852), Marx gives this description of the lumpenproletariat:
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 is a rhetorical flourish, however, which equates the lumpenproletariat, the rentier ('coupon clippers') class, and the apex of class society as equivalent members of the class of those with no role in useful production.