On 26 and 27 February, Colonel Lev Smirnov, deputy prosecutor for the Soviet Union, read the report on the occupation of the USSR. During his speech, he called witnesses, citizens of the USSR and Poland, who had personally experienced what they told the tribunal: the killing of women and children by the Nazis, massacres of prisoners, the hell of Jewish ghettos and death camps, and destruction of cultural monuments. For the first time, the world learned about the scale and brutality of the atrocities of the Nazis.

Source:
Nuremberg Trial Proceedings, Volume 8