Why do you think Hitler and the Nazi party decided to use propaganda
to "further spread anti-semitism"?

Through blame and various power sources

Explanation:  

Hitler and the Nazi Party didn't just spread their anti-Semitic views through their position, but they also gave reasons to blame them, such as shrewd businessmen Jews (who were making quite a lot of money and living a good life) be the blame for why the Weimar Republic and Germany's economy was spiralling down, this sparked resentment against most Jews and rose a stepping stone to Hitler's absolute power. Along with his claims against the Jews, he utilized a group called the Sturmabteilung, it spread the parties' views including anti-Semitic ones and usually resorted to violence to prove that to many who were unwilling to accept.

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