This week, the US Social Forum takes place in Detroit. Over 20,000 activists, artists, students, teachers, and everyday people are gathering in the heart of post-industrial America to strategize and build together with the knowledge that "another world is possible, another U.S. is necessary." Naomi Klein is coming, Jobs with Justice is here, and I'm here, too, blogging daily for The Progressive. And the revolutionary hip-hop group Rebel Diaz is here, too. Listen to this remix of the classic labor folk song, and ask yourself: "Which side are you on?"