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In page Shulamith Firestone:

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Firestone was identified as a radical feminist due to her belief that women constitute an oppressed sex class and that women's liberation could only be achieved through the revolutionary dismantling of the global patriarchal system. She drew upon the works of Karl Marx and Friedrich Engels,[1] while also critiquing them for not offering a class-independent analysis of women's oppression. Firestone expanded their theoretical framework to include the subordination of women as a distinct and foundational category of analysis.[citation needed]