Erik Magnus during the Holocaust
|Allies||World War II|
|Family and Friends||Nazi|
The Holocaust was not named nor elaborated on. It was simply implied on X-Men.
In the Comics
Magneto was originally a man during the Holocaust. As time went on it became more unbelievable that he could be a man during the Holocaust and still remain a threat to the X-Men. He was then de-aged to a boy. The series maintained the latter explanation.