Radical feminists have been an essential part of the broader progressive movement for social justice from the Second Wave of feminism in the 1960s through the present. Radical feminism puts front and center the question of female liberation, i.e., how to end female oppression and subordination by a patriarchal society, therefore raising important issues for the left.
We are therefore disturbed by recent demonization, intimidation, and threats of violence against radical and lesbian feminists by certain segments of the transgender community and their supporters who have attempted to silence feminist voices and have had a chilling effect on the ability to engage in open discussion and debate on complex issues of sex, gender, and sexuality, a debate that is sorely needed in order to build an effective and united movement.
http://www.oldandnewproject.net/Essays/Stop%20the%20Harassment%20ad.html