In recent years, several of America’s leading art museums have voluntarily given up their finest pieces of classical art to the governments of Italy and Greece. The monetary value is estimated at over half a billion dollars. Why would they be moved to such unheard-of generosity?The answer lies at the Getty, one of the world’s richest and most troubled museums, and scandalous revelations that it had been buying looted antiquities for decades. Drawing on a trove of confidential museu...