" Beginning in the late 1960s, some activists managed to establish illegal, clandestine structures committed to nonviolent action. (...) This nonviolent underground had several expressions to aid those in danger: the two most common were to help ferry draft resisters and antiwar soldiers out of the country and to provide safe abortions for women in need before the practice was legalized in 1973. In the 1980s, much of this infrastructure was revived and expanded to provide sanctuary for refugees fleeing repressive, U.S.-backed military regimes in Latin America. The experiences of these nonviolent revolutionaries disentangle militancy from violence and violence from clandestinity. "

― , The Struggle Within: Prisons, Political Prisoners, and Mass Movements in the United States