From Eleanor Marx: Working Women vs. Bourgeois Feminism (italics mine):
There is no doubt that there is a women’s question. But for us – who gain the right to be counted among the working class either by birth or by working for the workers’ cause – this issue belongs to the general working-class movement. We can understand, sympathise, and also help if need be, when women of the upper or middle class fight for rights that are well-founded and whose achievement will benefit working-women also. I say, we can even help: has not the Communist Manifesto taught us that it is our duty to support any progressive movement that benefits the workers’ cause, even if this movement is not our own?