Karl Marx defined the "working class" or proletariat as "those individuals who sell their labor and do not own the means of production" whom he believed were responsible for creating the wealth of a society (buildings, bridges and furniture, for example, are physically built by members of this class).
The proletariat are further subdivided by Marxists into the ordinary proletariat and the lumpenproletariat, those who are extremely poor and cannot find legal work on a regular basis. These may be prostitutes, beggars, or homeless people.
See also: trade union, middle class, blue collar, white collar, lower class
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