Judging from the relative lack of feminist activism, the answer seems to be very few. I don't know the answer, but something drastic needs to be done. I never met Emma Goldman, but Madonna is no Emma Goldman.
Rape is to sexism what lynching is to racism.
Battering is to sexism what night riding and police violence are to racism. Poverty, inferior work conditions, inferior education, and cultural stereotypes are to sexism what the same conditions are to racism. Rape is increasing. To be afraid when walking in public is an abominable condition. Half the population of the U.S. endures such fear during much of their lives.