"Dirty money" refers to money that has been obtained through illegal or unethical means, such as drug trafficking, theft, or corruption. Full definition
The federal government brought in a set of rules to address this problem a few years ago, but tracking dirty money is proving difficult. (canadianlawyermag.com)
It therefore calls for such a system to be introduced, to take the «dirty money out of politics». (theconversation.com)
Property purchases provide perfect cover for those attempting to hide dirty money because of the large sums involved. (lawyer-monthly.com)