old man — You are correct about Ha’aratzot and not Kehillot. (Thank you)
From the book “The Rebbe Speaks” by R. David Meisels, c. 2012 (concerning the Satmar Rebbe, R’ Yoel, zt”l), page 72:
“…the Vaad cited the Gemara (Yuma 47a) that relates how Kimchis merited seven sons who were Kohanim Gedolim due to the fact… The Vaad concluded that if vigilance in this area brings so much blessing, … Around the year 5430 (1670), the Vaad issued a takanah that women should shave their hair to avoid any exposure.”
The above book regrettably has no footnotes/Mareh Mekomot.
As noted in my original posting, I (simply) read, but did not have a chance to research further.