Where did scientist like einstein, fermi, teller, and bloch emigrate in order to escape persecution and pursue scientific research

Scientists such as Einstein, Fermi, Teller, and Bloch emigrated in order to escape persecution and to pursue scientific research in the United States. Einstein was a famous physicist who discovered the famous energy equation E=MC^2. Fermi was also a famous physicist who was involved in the infamous Manhattan Project that helped to build the world's first atomic bomb. 

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