The underclass is the bottom rung of a hierarchical society. Made up of people affected by *systemic violence* whether it be classism, systemic racism, systemic sexism etc. People whose quality of life is objectively harmed by living in a capitalist society.
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Underclass is a useless word. How can you quantify the underclass? Are they people who are oppressed? Then wouldn't the anarchist oppression of the bourgeoisie be making them the underclass?