Thailand's top investigative agency is widening a crackdown on illegal crypto mining that it says doubles as a laundering machine for Chinese-linked crime syndicates. The Department of Special Investigation said on Friday it had expanded its probe into a network of "grey" Chinese capital, a term for illicit funds moved through legitimate-looking channels, tied to illegal mining and transnational money laundering, with financial flows of over 10 billion baht ($300 million) a year, according to a DSI press release.