Avodah Zara 4:10

Let’s say that an idolator is found standing next to a Jew’s wine vat. If he has a lien on the vat, the wine is prohibited (because we assume that he might have taken some); if he does not have such a lien, then the wine remains permitted. Let’s say that an idolator fell into the vat and his body was recovered, or if he measured it with a reed or used a reed to flick a wasp out of the vat, or if he slapped the top of a fermenting barrel to move the foam. Each of these things actually occurred and the Sages ruled that the wine could be sold (to non-Jews) but Rabbi Shimon permitted it even for drinking. What if the idolator picked up a barrel and threw it into the vat in anger? This also happened and the Sages declared the wine to be fit (i.e., even for drinking).

Avodah Zara 4:11

Let’s say that a Jew makes wine for a non-Jew while in a state of ritual cleanliness and he leaves it on the non-Jew’s property in a building that opens to a public thoroughfare. In a city of both Jews and non-Jews, the wine is permitted; in a city that consists entirely of non-Jews, it is prohibited unless he places a guard to watch it. The guard need not sit there and watch it constantly; it is permitted even if he comes and goes (i.e., checking on it periodically). Rabbi Shimon ben Elazar says any non-Jew’s domain is the same (i.e., it need not be the owner’s property).