On the 44th anniversary of the Khmer Rouge entering Phnom Penh, the Brennan Center's Andrew Boyle discusses his work helping to prosecute the perpetrators the of genocide and other crimes against humanity in 1970s Cambodia. Boyle details the cases, the defendants, and the controversies surrounding the tribunal. Why did justice take so long? How did Cambodians react to the trials? And why is this genocide conviction so significant?