‘John Heartfield (1891–1968) is the anglicized name of the German photomontage artist Helmut Herzfeld. Heartfield developed photomontage into a form of political and artistic expression. His photomontages satirising Adolf Hitler and the Nazis often subverted Nazi symbols such as the swastika in order to undermine their propaganda message.’
– Wikipedia

Thank you to Todo Pipas, Smabs Sputer and Kurositas