When William Stephenson arrived in the US towards the end of June 1940 with instructions from the head of MI6 to ‘organise’ American public opinion, Britain was on the verge of defeat. Surveys showed that just 14% of the US population wanted to go to war against Nazi Germany. But soon that began to change. Those campaigning against America’s entry into the war, such as legendary aviator Charles Lindbergh, talked of a British-led plot to drag the US into the conflict. They feared that the British were somehow flooding the American media with ‘fake news’, infiltrating pressure groups, rigging opinion polls and meddling in US politics. These claims were shocking and wild: they were also true. That truth is revealed for the first time by Henry Hemming, using hitherto private and classified documents.