Lois Jenson and her coworkers Patricia S. Kosmach and Kathleen Anderson filed the lawsuit Jenson v. Eveleth Taconite Co. in 1988, after years of harassment at Eveleth Mines. The case became the first sexual harassment class action tried in US federal court and set a precedent for future harassment trials.
https://www.mnopedia.org/event/jenson-v-eveleth-taconite-co