Communism and feminism
Communism and feminism have some goals in common.
The building of socialism will begin only when we have achieved the complete equality of women. - V.I. Lenin, The Task of the Working Women's Movement in the Soviet Republic, 1919. 
It should be noted at the outset that since feminism is based on a fallacy, i.e., that there are no sex differences, feminism is inextricably linked with socialism.