Since 1949 Pacifica Radio has been a voice of dissent, an arena for protest and a space in which to imagine an alternative American dream. Raided by the FBI, blown up by the Ku Klux Klan and frequently torn apart by internal troubles, Pacifica has both reported and reacted to the major social upheavals of American life and liberty. Mike Marqusee pieces together an archival history of radical American radio. Producer Mark Burman