My son and I were talking about the problem of African debts. Apparently, much of the money was stolen from by the ruling classes of those countries. He came up with a solution, and, quirky as it is, I'm liking it more and more.
Offer it to those seeking early release - the US will pay for your passage to the country that owes us for the last round of aid. We'll supply all the information, it's up to you to figure out how to squeeze it out of the crooks. Many of these guys are experienced in debt collection - they don't take post-dated checks or excuses. Once they turn in a pre-set amount, they can either take their freedom and leave, or stick around, and take 1/2 of what they collect.
This solution relieves the overcrowding in prisons, gets the money back, and gives the ex-prisoner a fresh start.