Except they ran the government.
There are many inciteful posts on both sides in this thread. However, I think yours wins.
No they absolutely did not.
The most influential of them was Harry Dexter White, who “may” (evidence is WAY out on this) have delayed a gold shipment to Chaing that “may” have caused desertions in his army. But Chaing lost to Mao long before that.
Others wrote stuff in magazines, that “may” have affected the opinions of a few elites. But the fact is, their influence was overwhelmingly aimed at China, and there wasn’t a whole lot we could do there.