Perhaps no single person in the 20th century has done more to preserve, broadcast, and re-distribute folk music than Pete Seeger, whose passion for politics, the environment, and humanity have earned him both ardent fans and vocal enemies since he first began performing in the late '30s. His never-ending battle against injustice led to his being blacklisted during the McCarthy era, celebrated during the turbulent '60s, and welcomed at union rallies throughout his life.