There's an episode of
Better Call Saul where Mike Ehrmantrout launders his $200,000 through a shady company. He gives them the cash, they pay him $20,000 a month for "logistics consulting." He tells them "make it 'security consulting.' I don't know anything about logistics." So he's got a 1099 or W-2 for his money, he pays taxes on it, and it's all clean.
How many no-show jobs like this exist?
Or actual jobs at a 501(c)(3). You can start one, hire yourself and your "business associates" at salaries that are somewhat justifiable, spend 5-10% of the assets annually on legitimate charity work, and you're set.
Of course, this doesn't deal as well with drug cartel-class amounts of money.