I thought USAID was all "aid to outside the USA" type shit so lay it down like I'm a teenager.
I will break it down.
Lefty govt worker sets up NGO for foreign aid in the Congo. They get US government gibs, grants, money and apply for them depending on the supposed benefit. US government pays out the money to do aid in the Congo, but the aid never goes to the people. It goes to a sketchy accounting firm that manufactures numbers, support, benefits so that when the audit comes, they can say "look, heres all the money we spent, heres it is working in action". Since no one is going to fly out to the Congo to physically audit and question the numbers, they just accept it and give out more funds because the numbers say its working.
The money is now laundered since they have manufactured receipts to show they built 10 mud huts a month at 10,000 each even though the shelters don't exist. From there, the lefty NGO director can use the funds as donations to political campaigns, pay people off for protesting or in more extreme cases, use it to fund war or acquire land and riches in Africa, or just enrich themselves with the government grant money through wire transfers or offshore accounts after its sent out of Africa.
In the case of the Somalis, they are not even laundering it. They get fraud money from Medicare and Medicaid, extract the cash from banks under $9990 amounts and physically transport it out of the country to their shithole where its used on their families or to fund clan wars, or other terror ops.
Edit: I will add that if a US citizen goes abroad and opens an account with their passport, the foreign bank
does still report to the IRS, but if its under another foreign national passport that doesn't have bank reporting agreements with each country, its hidden from the respective foreign nations tax system. This is why these operations with browns and illegals works so well is because they have family ties back home where they can trust someone to open an account on their behalf or are in on the fraud operation.