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plural useful idiots
Definition of useful idiot
: a naive or credulous person who can be manipulated or exploited to advance a cause or political agenda
It is one task of the KGB [in 1982] to apply its skills of secrecy and deception to projecting the Soviet party's influence. This it does through contacts with legal Communist Parties abroad, with groups sympathetic to Soviet goals, with do-gooders of the type that Lenin once described as "useful idiots" … . — The Wall Street Journal
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Time Traveler for useful idiot
The first known use of useful idiot was in 1864
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