"The Martians" was a term used to refer to a group of prominent Hungarian scientists who emigrated to the United States in the early half of the 20th century.
This group included people like John von Neumann, Paul Erdős, several Nobel laureates and George Pólya.
The name originated from a joke by Leo Szilárd – who supplied the perfect reply to the Fermi Paradox (high probability that aliens exist, so they should be here already): "They are among us, but they call themselves Hungarians."