Viktor Külföldi, real name Jakab Mayer-Rubcsics, born Jacob Mayer (1844 – March 5, 1894) was a Hungarian Socialist, journalist, and lecturer. Born in Thalheim, Germany (or Switzerland? ), he was known in his adopted country by the alias "Külföldi" (Hungarian for "foreigner"). In 1871 he became a member of the International Working Men's Association. Together with (1842–1907) and, he co-founded the first Hungarian Socialist organization, the. For organizing a strike by the GWMU, he, among others, was arrested (1871–2) and accused of high treason; he was eventually acquitted because of lack of evidence. In 1877 Külföldi founded the Social-democratic newspaper Népszava ("People's Voice"). He retired from the worker's movement in 1890 and died in Budapest in 1894.

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