Good questions, there are disagreements on those points even among libertarians. It's tough to name a single digestible reference because this is such a broad subject. But this one is pretty comprehensive: https://en.wikipedia.org/wiki/Non-aggression_principle
Okay, thanks. Some of the references from the article are good, too.
It's more or less clear how to apply the principle when two individuals interact. People form groups, however, both explicitly and implicitly. If I am part of a group that violates another's rights, am I still not accountable if I am not actually the individual(s) who does the physical act?
