Kudos to Blogger Gmuoruo for his commendably exact and most appropriate citation of the following world-famous phrase originated legendarily from Vladimir Lenin, which is actually new to Blogger Pascal:
A useful idiot ( also useful fool ) is "a dupe of the Communists", usually a citizen of a non-communist country sympathetic to the Soviet Union who is susceptible to propaganda and is cynically misused. The phrase was used by Soviet communists and the KGB to refer to persons in the West their country had successfully manipulated. The phrase is often attributed to Vladimir Lenin, but it remains controversial whether he used this term in his publications.
The wording from written works by Lenin about the "rope" was as follows:
They [capitalists] will furnish credits which will serve us for the support of the Communist Party in their countries and, by supplying us materials and technical equipment which we lack, will restore our military industry necessary for our future attacks against our suppliers. To put it in other words, they will work on the preparation of their own suicide.
John King Fairbank, Mrs. Fairbank & Lin Huiyin, etc.
The Fairbanks and The Liang Sicheng