The People's Republic of China has a "magic weapon", according to its founding leader Mao Zedong and its current president Xi Jinping. It is called the United Front Work Department (UFWD) - and it is raising as much alarm in the West as Beijing's growing military arsenal.

Yang Tengbo, a prominent businessman who has been linked to Prince Andrew, is the latest overseas Chinese citizen to be scrutinised - and sanctioned - for his links to the UFWD.

The existence of the department is far from a secret. A decades-old and well-documented arm of the Chinese Communist Party, it has been mired in controversy before. Investigators from the US to Australia have cited the UFWD in multiple espionage cases, often accusing Beijing of using it for foreign interference.

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The United Front - originally referring to a broad communist alliance - was once hailed by Mao as the key to the Communist Party's triumph in the decades-long Chinese Civil War.

After the war ended in 1949 and the party began ruling China, United Front activities took a backseat to other priorities. But in the last decade under Xi, the United Front has seen a renaissance of sorts.

Xi's version of the United Front is broadly consistent with earlier incarnations: to "build the broadest possible coalition with all social forces that are relevant", according to Mareike Ohlberg, a senior fellow at the German Marshall Fund.

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Today, the UFWD seeks to influence public discussions about sensitive issues ranging from Taiwan - which China claims as its territory - to the suppression of ethnic minorities in Tibet and Xinjiang.

It also tries to shape narratives about China in foreign media, target Chinese government critics abroad and co-opt influential overseas Chinese figures.

"United Front work can include espionage but [it] is broader than espionage," Audrye Wong, assistant professor of politics at the University of Southern California, tells the BBC.

"Beyond the act of acquiring covert information from a foreign government, United Front activities centre on the broader mobilisation of overseas Chinese," she said, adding that China is "unique in the scale and scope" of such influence activities.

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Some experts say that the long arm of China's United Front is indeed concerning. "Western governments now need to be less naive about China's United Front work and take it as a serious threat not only to national security but also to the safety and freedom of many ethnic Chinese citizens," [politics professor at Johns Hopkins University Dr Ho-fung] Hung said.

[But he and Audrye Wong, assistant professor of politics at the University of Southern California, say that] it's important to remember that not everyone who is ethnically Chinese is a supporter of the Chinese Communist Party.

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