Hefker
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Hefker (Hebrew: הפקר) is ownerless property under rabbinic law. While some property is intrinsically ownerless, especially during shmita, ordinary property can also be made formally ownerless by written or express renunciation of its owner or by judicial action (as shown in Gittin 36b). Even absent such an action, property will become ownerless if the owner was a convert to Judaism who dies without Jewish heirs (as seen in Bava Batra 149a).
Hefker re-emerged in the early 20th century as a central symbol of social justice in European Hebrew and Yiddish literature.