Then in 1943 he was told to move back to Germany or he would lose his German citizenship. Faced with this he had little choice but to quickly apply for Swiss citizenship, which was soon granted.
Pagkatapos ay sa 1943 siya ay sinasabi na bumalik sa Germany o siya ay mawalan ng kanyang pagkamamamayan ng German. Mukha sa mga ito niya maliit ngunit pinili upang mabilis na mag-aplay para sa Swiss pagkamamamayan, kung saan ay ipinagkaloob sa lalong madaling panahon.