Operation Pig Iron was asecret service measure planned and carried out by theAmericanOffice of Strategic Services (OSS) from the summer of 1944 onwards during theSecond World War. The aim was toindoctrinate the enemy by using "bombs" containing miniature editions of the propaganda magazineDas Neue Deutschland. These bombs were dropped by plane over enemy territory. With more than 8.9 million (of a total of about 9.5 million) printed copies of the journal, the miniature edition was the most massive way of distributing thispropaganda tool.
The magazines, which previously had been printed in normal format, were reduced in size by a photo-technical process to 10 × 6 ½inches - which corresponded to a quarter of the normal size - and then processed into rolls of 1500 copies each. These rolls were finally packed into specially designedcylindrical devices. Afterwards they were transported by truck fromRome toFoggia, where they were filled into bombs. TheUS Air Force stationed in that city subsequently flew these bombs to the centre of the enemy inGermany orAustria to drop them on the ground.
As other propaganda material was also to be distributed in this way - in which the obviousAllied origin could not be denied - a cunning trick was used to make the alleged German opposition magazineDas Neue Deutschland appear plausible. To do this, an additional imprint was placed on the front page of thejournals that were being dropped, which was supposed to point to alleged chance finds during the advance of Allied forces. Thus, for example, the following text appeared on the front page: (in German) "During the occupation ofParis this German newspaper fell into the hands of the Allies". The success of this measure could also be seen in the fierce counter-reaction on the German side that followed later, for example, whenHeinrich Himmler's own propaganda magazineDas Schwarze Korps drew attention to the magazine'straitorous authors. This led to devastating comments on the contents of the journal and on the authors themselves.
Operation Pig Iron is regarded as the most successful US-American measure to distribute the propaganda magazineDas Neue Deutschland.