The FBI had a 1,427-page file on Albert Einstein. When Albert Einstein moved from Germany to the US in 1933, he was already an internationally renowned physicist. One year before that, the FBI began keeping tabs on him because he was outspoken against various social issues, such as nationalism and racism. Later, Einstein took a stand, particularly against the US nuclear ambitions, which led the head of the FBI to become deeply suspicious of him and even label him as a communist.