Many people alive today are too young to remember the genocide of Cambodia under the Khmer Rouge. Some of the leaders are finally being brought to trial for the torture and murder of millions of innocent people.
I remember it very well. I remember cheering when Vietnam finally invaded and brought this to an end. I could not believe how silent all of the countries of the world were for three full years as the slaughter had rolled on. The Vietnamese became the heroes and I'll always remember that.
This article can bring the too young to remember quickly up to speed, in a sadly artistic way:
http://www.iht.com/articles/2007/10/26/asia/cambo.php