Como dizer "Idiota útil" em inglês

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Useful idiot
In political jargon, a useful idiot is a derogatory term for a person perceived as a propagandist for a cause, the goals of which he or she does not fully comprehend, and who is used cynically by the leaders of the cause. (wikipedia)
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It also can be a derogatory expression to mean:
"One who is seen to unwittingly support a malignant cause through their 'naive' attempts to be a force for good." Wikictionary.
That is, not necessarily to be related to policy matters, but yes, it applies to it and many other fields of life.