"He was at Buchenwald"
Survivors in Buchenwald Concentration Camp
Public DomainSurvivors in Buchenwald Concentration Camp

Buchenwald near Weimar in Germany was the first, and one of the largest, of the Nazi concentration camps.  Although it was not an extermination camp, the number of deaths there between 1937 and 1945 has been estimated at 56,545. 

From 1945 until 1950 it was used as an internment camp by the NKVD, the Soviet intelligence service and forerunner of the KGB.