Radical Sisters by Anne Valk might be worthwhile, it's a bit late in the timeframe you presented, but, it presents a very interesting look at the divide and cooperation between feminist groups fighting for equality and black women wanting racial equality as well and how different groups approached this (e.g is it worth fighting for feminism when I can't even be black yet?)

Probably won't give you the answer you're looking for for your activism, but will provide some of the background on how groups wanting similar goals may group them differently in levels of importance. Brian Behnken's Fighting their own battles might be worthwhile too.