useful idiot

Definition
Description for people of influence who support a cause they fail to understand the full ramifications of, and end up being exploited by the leaders of that cause. Allegedly attributed to Lenin in describing western personalities such as H.G. Wells, George Bernard Shaw, Paul Robeson and journalist Walter Duranty who visited the USSR during times of famine, were allowed to visit only select areas, and then returned home giving glowing reports of the new “workers’ paradise”.