Anyway, here are the sources that show the linkage between the slogan "Sisterhood is Powerful" and the TERFs behind the slogan:
Sisterhood is Powerful (book), edited by Robin Moran:
https://en.wikipedia.org/wiki/Sisterhood_Is_Powerful
Robin Morgan's bigotry toward Beth Elliott:
https://revolution.berkeley.edu/robin-morgan-slanders-beth-elliot/
Kathie Sarachild (originator of slogan):
https://en.wikipedia.org/wiki/Kathie_Sarachild
Sarachild as a primary signatory of an anti-trans statement signed by 48 TERFs from various countries (link opens PDF file):
https://meetinggroundonline.org/wp-content/uploads/2013/10/GENDER-Statement-InterActive-930.pdf
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