Three decades ago, Chinese dissidents were being smuggled out of the country in a secret operation called Yellow Bird - but as one of them tells the BBC, Beijing is still pursuing them.
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Yan took US citizenship and lived a model American life. He joined the US army and served in Iraq as a military chaplain.
He might have thought the hand of China’s Communist Party could not reach him in his new home, but he was wrong.
In 2021, he decided to run for public office. He stood as a candidate in the Democratic primary for New York's 1st Congressional District.
Yan started noticing some odd occurrences during his campaign. Strange cars followed him and lurked outside where he was staying at three in the morning. At campaign events, people would try to block him from speaking.
He learned why when the FBI came to talk to him. A US private investigator had told them he had been approached by an individual in China, who had asked him to carry out surveillance on Yan. It seems the idea of a former Tiananmen protester entering US Congress was unacceptable.
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The person instructing the private investigator, the FBI assessed, was working on behalf of China’s Ministry of State Security. They were indicted but could not be arrested because they were outside the US.
China has consistently denied claims of political interference. But this is not the only case where it is alleged to have become more assertive in tracking down those it considers dissidents in other countries. There have been claims of “overseas police stations” in the UK and US and of individuals being pressured to return to China or be silent.
Yan’s story reveals that as China has become more confident and controlling at home, it has also sought to extend its reach abroad. And that is increasingly causing friction over issues of espionage, surveillance and human rights.
Nothing happened, but anyone involved with nothing happening is a security threat.