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While some citizens of conquered nations accepted Nazi rule, others did not, and they placed themselves at great personal risk to subvert and resist the occupiers. The Allies helped Resistance groups in many ways. Intelligence agencies such as Britain’s Special Operations Executive (SOE) and America’s Office of Strategic Services (OSS) provided covert support and surreptitiously gathered information on the enemy. Both sides fighting in World War II conducted psychological warfare, but the British excelled in the art of black propaganda—material designed to look like genuine German newspapers, ration cards, and similar documents.