The Truth Behind Hassidic Women’s Head Shaving

This is what I have heard as the source:

Another explanation for the custom of shaving the head is based on a concern that a woman’s hair might become unintentionally exposed from under the wig or other hair covering that she is wearing.[15] There is also a theory that women began shaving their heads in order to deter the rape which was rampant as part of the many pogroms the Jews suffered in Europe. It is even suggested that the custom evolved in order that women not come to violate Shabbat by squeezing out their hair![16]”