Paul Erdos, traveling mathematician extraordinaire, has been on Home Economics before. The Hungarian distinguished himself both in abstract thinking and in being a prolific houseguest. This willingness to travel undoubtedly helped him to become the most collaborative scholar in mathematics.
This free-spiritedness apparently made the FBI uncomfortable. This video (13 min) will fill you in on all the details. One supporter claimed to the government agency that Erdos could never be a spy because his allegiance was to the truth, in science and not in politics.
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