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As highly as Spanish artists Santiago Sierra and Jorge Galindo function as creative beings, they’re equally comfortable as political activists. Their work is at its best when those two fields combine, as it does in Los Encargados, the pair’s film now showing in the Hirshhorn’s Black Box. In August 2012, the duo organized a protest in which seven black Mercedes drove down Madrid’s Gran Vía with upside-down portraits of Spanish political leaders affixed to the top of each car. The film documents the protest and explains how increased government intervention limited the voice of the people, prompting the artists to protest. The end result, though eerie and evocative of hanging, yields consideration from those completely unaffected by Spanish politics. The exhibition is on view daily 10 a.m. to 5:30 p.m. to May 18 at the Hirshhorn Museum and Sculpture Garden, 7th Street and Independence Avenue SW. Free. (202) 633-4674. hirshhorn.si.edu.