"Flore Celestine Thérèse Henriette Tristán y Moscoso better known as Flora Tristan (1803 – 1844) was a French-Peruvian socialist writer and activist. She made important contributions to early feminist theory, and argued that the progress of women's rights was directly related with the progress of the working class. She wrote several works, the best known of which are Peregrinations of a Pariah (1838), Promenades in London (1840), and The Workers' Union (1843). 

"Tristan recognized that the working class had been fighting for over twenty-five years to no avail. Her suggested solution was to act and create a Workers' Union. She saw a great advantage to this because “divided, you are weak and fall, crushed underfoot by all sorts of misery! Union makes power. You have numbers in your favor, and numbers mean a great deal.” Through union dues, she argued for plans to provide the proletariats’ children with safe havens and increased access to education, to build palaces for the ill and wounded workers, and to reach out to manufacturers and financiers, including those among the nobility, in order to sustain and maintain such programs. ...

"In two different essays, Flora Tristan acknowledged the need for the liberation of women in order to complete the emancipation of the working class, seeing as the working class itself was fractured. She argued that once society fixes these fissures (women's rights), the rest would fall into place. In that sense, women's liberation would lead to the greatest good for the greatest number of people, thereby supporting a Utilitarian mindset. Despite her positive stance on women's liberation, she recognized that in the post-revolution French society, women would not be easily considered equal just because they were human beings. She therefore had to base her argument on a series of benefits to the male majority.

"In addition to introducing new ways of thinking about socialism, Tristan was also the first to connect the emerging social rights movement to the idea of women's liberation. In doing so, she laid the groundwork for a new ideology—feminism. She made the analogy between the proletariat to the bourgeoisie and the wife to the family before Friedrich Engels, as is referenced in a posthumous collection of her notes by Abbe Constant entitled The Emancipation of Woman and the Testament of the Pariah: “The most oppressed man finds a being to oppress, his wife: she is the proletarian of the proletarian.”

"Tristan's analogy is also more articulate than Engels'. The Worker's Union explained that the liberation of women would be the continuation of what the French Revolution had initiated. Like the proletariat, women would also have their day: “What happened to the proletariat, it must be agreed, is a good omen for women when their '1789' rings out.” 

https://en.wikipedia.org/wiki/Flora_Tristan

Flora Tristan, The Workers' Union Chapter III - "Why I Mention Women"

Full text at: https://drive.google.com/file/d/1YC8z3sZ59OzJlNaqY7nhh80BaOwBCcTD/view

"The most oppressed man can oppress one being, his wife. She is the Proletarian of the Proletarian himself." —Flora Tristan, Chloderlos de laclos, oeuvres complètes, ed. Maurice Allem (Paris: Gallimard, 1951).