After emigration to Paris in the 1930s, he became part of the Hungarian circle of artists and writers.

Istvan Hadju was born in 1907 to a Jewish family in Torda, Torda-Aranyos County, Transylvania, Kingdom of Hungary (now Turda, Cluj County, Romania).

Numerous Jewish Hungarians, most of them artists and writers, were part of the Résistance.

Many carried out their actions outside Paris, as foreigners had been formally evacuated with the outbreak of war in September 1939.

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