HISTORY OF THE “WHITE RIBBON” PLEDGE: After the École Polytechnique massacre on December 6, 1989, where 14 women were killed by an anti-feminist man, a movement formed in Canada involving men wearing the white ribbon to signify opposition to violence against women.
The White Ribbon Campaign (WRC) appeared in 1991 in relation to this movement and became one of the largest men’s anti-violence programs in the world. Started by activists such as Michael Kaufman, it has spread to over 57 countries around the world. It is now an international effort of men and boys working to end violence against women. (from Wikipedia)