Hundreds of barber shops and other cash-heavy businesses have been targeted in a three-week money laundering blitz.
Police went to 265 premises, including vape shops, nail bars, American-themed sweet shops and car washes across England in a crackdown on high street crime.
The National Crime Agency (NCA) said 35 arrests were made, 97 people suspected to be victims of modern slavery were placed under police protection, and bank accounts containing more than £1m were frozen.
More than £40,000 in cash, some 200,000 cigarettes, 7,000 packs of tobacco, and more than 8,000 illegal vapes were also seized during Operation Machinize, which involved 19 different police forces and regional organised crime units.
Officers also found two cannabis farms containing a total of 150 plants, while 10 shops have been shut down.
The NCA estimates that £12bn of criminal cash is generated in the UK each year with businesses such as barber shops, vape shops, nail bars, American-themed sweet shops and car washes often used by criminals.
Rachael Herbert, deputy director of the National Economic Crime Centre at the NCA, said: “Operation Machinize targeted barber shops and other high street businesses being used as cover for a whole range of criminality, all across the country.
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“We have seen links to drug trafficking and distribution, organised immigration crime, modern slavery and human trafficking, firearms, and the sale of illicit tobacco and vapes.
“We know cash-intensive businesses are used as fronts for money laundering, facilitating some of the highest harm and highest impact offending in the UK.”
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Security minister Dan Jarvis said the operation “highlights the scale and complexity of the criminality our towns and cities face”.
“High street crime undermines our security, our borders, and the confidence of our communities, and I am determined to take the decisive action necessary to bring those responsible to justice,” he said.
