This first cross-national book-length study of street art as political protest and communication focuses on art forms traditionally used by collectives and state interests in the Hispanic world–posters, wallpaintings, graffiti, murals, shirts, buttons, and stickers, for example. Professor Chaffee examines the motives behind the use of street art as propaganda and seeks to explain how it is effective. Using field research and a sociopolitical approach, he assesses contemporary street art in Spain, the Basque country, Argentina, and Brazil. He shows how street art is a barometer of popular conflicts and sentiments across the political spectrum. This comparative analysis is intended for students, teachers, and professionals in the fields of communication, political science, history, and popular culture.