When Benjamin Ferencz was 27 years old, he prosecuted his very first trial. There were 22 defendants, each of them high-ranking members of Nazi Germany’s death squad. The entire world was watching.

Today, we take a look at the Nuremberg trials and their role in defining international law after World War II.

This episode originally aired in 2018—this version includes an update with Benjamin Ferencz, who celebrated his 101st birthday earlier this year.