Responsa for Avodah Zarah 61:1
סתם יינם אסור בהנאה ומטמא טומאת משקין ברביעית המפקיד יינו אצל עובד כוכבים אסור בשתיה ומותר בהנאה
[2] Ordinary wine belonging to non-Jews, from which it is likewise forbidden to derive any benefit, and a quarter [of a log] of which renders drinks [or foods] impure. [3] One who deposits his wine with a non-Jew, it is forbidden to drink it, but it is permitted to derive benefit from it.
Teshuvot Maharam
The wine of a (Jewish) infidel or of a Karaite, who does not trust the teachings of the Rabbis, is yayin nesek (forbidden wine), for, although they are not idolators themselves, they do not guard their wine from being handled by Gentiles.
SOURCES: L. 231.
SOURCES: L. 231.
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