Every Sunday since the end of World War II, musicians journeyed to Washington Square Park to sing folk-songs. Until one Sunday—after the City of New York denied the musicians a singing permit—they decided to protest instead. What resulted was a violent confrontation with authority. Listen as historian & museum curator Stephen Petrus, documentary filmmaker Dan Drasin, Folklore Centrum proprietor Izzy Young, and the editor of WashingtonSquareParkBlog.com Cathryn Swan discuss this formative moment in folk-music history.