There was much worse to come. At the modern House of Sharing in Bukchon, a scenic village of rice farmers and fishermen on the northern coast, old women recall in graphic detail the killing of hundreds in January 1949. A guide shows visitors the burial ground where large stones are strewn as the bodies were found. Small mounds mark the graves of children. Not far from Jeju International Airport, where many were buried, most of them were killed. At that time U.S. helicopters overhead. On the slopes of Mount Halla, a U.S. army communications unit was humming away. Who was ultimately responsible for these and many other episodes, known and verified, open for anyone to examine? The Americans don't actually deny complicity. They just don't say anything. That's not to say the Americans have to accept claims of a U.S. role. It's just that they owe the world, not just the victims' families, a promise to search the records and come up with documents, reports, anything revealing what the U.S. forces were up to.

Abstract
American Silence on Jeju 4.3
Uncovering Jeju Revolt
References

• Kirk Donald(Korea Times)