Here is more from a SpyTalk interview:
The entire U.S. intelligence community—17 agencies in all—has been penetrated by Chinese spies, says Nicholas Eftimiades, who recently retired as one of the U.S. government’s top experts on Chinese espionage.
He added, “I think if we're talking about [the] Justice [Department], the intelligence community, the 17 agencies including the DNI, I'd be stunned if there weren't dozens, absolutely stunned if there weren't dozens” of Chinese moles.
Eftimiades, who retired in 2017, quickly cautioned that probably only a small number—”less than a dozen”—have access to classified information. Many more are employed to find out just “who's who” in U.S. intelligence, “and where they're living and things like that.” But Eftimiades, author of two books on Chinese espionage, said there are “thousands more” moles in other, non-intelligence U.S. government agencies, as well as among contractors, corporations, think tanks and congressional offices.
Here is list from Think Tank Watch of former US intelligence officials who have worked or still work at US think tanks.