…[G]reat progress was evident in the last Congress of the American ‘Labour Union’ in that among other things, it treated working women with complete equality. While in this respect the English, and still more the gallant French, are burdened with a spirit of narrow-mindedness. Anybody who knows anything of history knows that great social changes are impossible without the feminine ferment. Social progress can be measured exactly by the social position of the fair sex (the ugly ones included).
Karl Marx, Selected Letters: The Personal Correspondence 1844-1877