This piece about the UK liver transplant matching algorithm, by @randomwalker and @sayashk, is well worth a read. Excellent example that algorithms that make real-world decisions aren't inherently problematic, but they can certainly be horrifyingly bad if not designed (and tested, and transparently published, and audited) carefully.
https://www.aisnakeoil.com/p/does-the-uks-liver-transplant-matching
