When gunmen ambushed a Mexican-Chinese businessman outside his Guatemala City casino in 2016, few outside the DEA paid much attention. But the shootout presaged the downfall of a man who, feds would later say, hadn’t just made a tidy living out of money laundering, but pioneered it.

But Xizhi Li, who grew up in the border town of Mexicali, was just one of a new army of Chinese money launderers who, tooled with millennia of underground banking skills, and China’s own economic policies, have become the go-to guys for Latin American cartels looking to wash their dirty cash. And with fentanyl flooding America’s streets, their work is becoming deadlier by the day.

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