For example hitler blame the Jews when really they did nothing wrong it was how hitler persuaded the people to believe what he said.

Well basically it was Hitler that was responsible for the Holocaust as the solution to the "Jewish Problem"

Further reading starts here: The Holocaust (http://en.wikipedia.org/wiki/The_holocaust)

Hitler was a charismatic individual who came along when the German nation needed someone to restore their pride after World War I. Because of that the German people followed him despite certain red flags. Hitler presented the Jews in particular and communists and others, as scapegoats for the German problems.