"The origin of the family, private property and the state" By Friedrich Engels pretty much sets out the crucial link between Feminism and Marxism, the latter purports to be a theory of everything. In Europe and the UK the feminism of De Beauvoir and Greer etc. is explicitly derived from these Marxist roots and so fuels the way feminism has an answer for everything and a goal "the eternal classless (communist) society. To be fair most "popular feminists" (as opposed to those in academe) parrot De Beauvoir lines without really understanding the theory but more as adding "gravitas" to what are usually just whining about their lives and jealousy of males. Everything (apart from actual changing sex) that is in the feminist agenda is right there in Engels' book. Now over 100 years old re reading it recently I was struck how contemporary its contents are in terms of modern feminism.