This group of Jewish ex-patriots included the wealthy, academics, and artists, many of whom resettled in the United States. All of them warned about German fascism, but one group of German immigrants—scientists—delivered a warning that was much more ominous. They were aware that an atomic bomb was theoretically possible and that German scientists were working to develop one. Several scientists, including Albert Einstein, sent a letter to President Roosevelt warning him that if a uranium-based atomic bomb was to be created, it must be created by the United States and not Germany. Roosevelt took
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