Nuremberg Race Laws - 1935
The Jewish race became subjects and weren't allowed to marry or have sex with aryans; hire arayan women as maids or have right of citizenship. According to the site, http://www.historyplace.com/worldwar2/holocaust/h-nurem-laws.htm, Hitler and the Germans were very concerned with Jews mixing pure genetics of Germans. They wanted to preserve their race. They also gave diagrams with who was allowed to be married because there were many disagreements as to who was pure and who wasn't.