Some laws concerning other people are understood to be observed also to non Jewish persons; e.g. that is is forbidden to murder.
Others have been interpreted to be valid only towards Jews; e.g. leaning out money for interest.
What are the criteria in halacha (Rabbinic after the end of the 2nd Temple until medieval tradition) to discern it?
After a while of study, parting from a closely related post on a particular commandment
Does ‘Love Your Neighbor As Yourself’ apply only to Jews?
that shows that there is no full consent on the interpretation, it seems more appropriate to focus on different rabbis and schools:
What opinions have been pronounced in halacha (Rabbinic after the end of the 2nd Temple until late medieval tradition) on this topic?