Kathie Sarachild is an American writer and radical feminist. In 1968, she took the last name "Sarachild" after her mother Sara. Kathie coined the phrase "Sisterhood is Powerful" in a flier she wrote for the keynote speech she gave for New York Radical Women's first public action at the convocation of the Jeannette Rankin Brigade. This was a slogan that would become synonymous with the radical feminist movement in the years which followed.