Some more mundane money laundering schemes:

--The US places limits on how much money people can contribute to political campaigns. In 1972, President Nixon's re-election financial arm, "The Committee to Re-Elect the President" (CREEP) set up an office in Washington DC, where people who wanted to buy favors from the Nixon Administration could bring large amounts of cash, off the books. Then couriers were dispatched with cash to set up bank accounts in the Caribbean and South America which were not under the jurisdiction of the US Treasury Dept. Those bank accounts then would be used to finance campaign contributions.

--US law requires all bank transactions greater than $10k to be reported to the Treasury Dept. A gang of Colombian drug dealers operating in NYC opened dozens of ATM accounts. They deposited amounts just under $10k in those ATMs around 11:30 p.m. Then their counterparts in Colombia would use their own network of ATM accounts to withdraw those amounts just before midnight. Not only were the amounts too small to be reported, they went in and went out too fast to be noticed.