On this week's show... * Thousands march nationwide on May Day for immigrant rights and an end to raids and deportations * Environmental justice organizers kick off Biojustice 2007 in Boston * Media Minutes gives this week's report on the intersection of media and democracy * an interview with Staughton Lynd on Ohio's Supermax prison in Youngstown and the history of the Lucasville uprising * and more in our local and global headlines