No. Most Jews were unaware of the existence and purpose of the Concentration Camps and the Death Camps.
I believe it was around October 1941.
The Nazis carried on a system of deception so that very many Jews didn't know that they were going to be killed.
An Appeal to the Jews of the World - 1941 was released on: USA: 1941 (limited)
Reports reached the British and US governments from late 1941 onwards (obviously not about every detail), but they did not want to know about what was going on.
It is impossible to know what went on in his mind, but he made the decision known in 1941 or 1942.
nothing.
In German occupied Europe Jews were segregated by law.
1941
Auschwitz
Jews were made to wear gold stars in April 1941. _______________ It was different in different countries, in Germany it was 19/09/1941.
With cruelity. Nazis hated Jews enough to gas and burn them.
In 1941.