This week we explore some of the most powerful artworks ever made, making the case for political art one work at a time. Pablo Picasso's Guernica, Kathe Kollwitz's prints, Kazimir Malevich's Black Square, Iri and Toshi Maruki's Hiroshima...

Art is a powerful democratic tool because it can inspire emotion and empower people to take direct action to achieve a social or political goal.