John Heartfield (born Helmut Herzfeld) was a 20th century German visual artist who pioneered the use of art as a political weapon. Some of his most famous photomontages were anti-Nazi and anti-fascist statements. Heartfield also created book jackets for book authors, such as Upton Sinclair, as well as stage sets for contemporary playwrights, such as Bertolt Brecht and Erwin Piscator.