The Allies; the British, Americans, and Soviets.
Nazi concentration camps ~ see link below .
Ghettos, concentration camps and extermination camps.
The Allies (including Britain) stopped the Nazi concentration camps and the Holocaust by invading and defeating Nazi Germany.
Terrible
1933
Concentration camps established by Nazi Germany were primarily liberated during World War II, with many being freed by Allied forces in 1944 and 1945. Notable camps, such as Auschwitz, were liberated on January 27, 1945, by the Soviet Army. The liberation of these camps marked a significant moment in the war, revealing the extent of the Holocaust and the atrocities committed against millions of people.
if you mean in the Soviet concentration camps, then poorly; they lost millions of soldiers in the camps.
allied forces arrived at the camps and freed the prisoners
The key distinction was between extermination camps and labour camps ("ordinary" concentration camps).
There werent American CIVILIANS killed in Nazi Concentration camps. Civillians implies that they were not serving. There were American men in the army who were killed in Nazi Concentration camps, but no civilians.
The camps were mainly in Germany and in Nazi-occupied Poland.
The extermination camps were top secret.