China has employed a "super aggressive" spy campaign in the United States on LinkedIn, according to the U.S. counter-intelligence chief William Evanina, who wants the social media website to strike down trolls as other tech giants have, CNBC reported. 

"I recently saw that Twitter is cancelling, I don't know, millions of fake accounts, and our request would be maybe LinkedIn could go ahead and be part of that," U.S. National Counter-Intelligence and Security Center executive Evanina told CNBC.

Chinese accounts are "contacting thousands of LinkedIn members at a time" in an effort to recruit spies in the U.S., something German and British officials have warned their citizens of, according to the report.

China's foreign ministry rejected the claims, saying via statement: "We do not know what evidence the relevant U.S. officials you cite have to reach this conclusion. What they say is complete nonsense and has ulterior motives."

LinkedIn, which has 575 million users worldwide, and more than 150 million in the U.S. alone, is talking to U.S. law enforcement about the Chinese spy campaign, but has canceled "less than 40" fake accounts, LinkedIn's head of trust and safety, Paul Rockwell, told Reuters, declining to identify those as connected to China.

"We are doing everything we can to identify and stop this activity," Rockwell added. "We've never waited for requests to act and actively identify bad actors and remove bad accounts using information we uncover and intelligence from a variety of sources including government agencies."

The attempts of espionage recruitment are not limited to China – Russia, Iran, North Korea, and others have been implicated, too – but "U.S. intelligence officials said China is the most prolific and poses the biggest threat," a claim the Chinese foreign ministry rebuked as "absurd logic,"  according to the report.

"The targets include experts in fields such as supercomputing, nuclear energy, nanotechnology, semi-conductors, stealth technology, healthcare, hybrid grains, seeds, and green energy," CNBC reported, adding the targets are "70 percent" aimed at the private sector vs. the U.S. government.

"They are conducting economic espionage at a rate that is unparalleled in our history," Evanina said, per CNBC.

LinkedIn "is a very good site, but it makes for a great venue for foreign adversaries to target not only individuals in the government, formers, former CIA folks, but academics, scientists, engineers, anything they want," Evanina added. "It's the ultimate playground for collection."

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