The Zero Aggression Principle says...
"No one should initiate harm against another or delegate doing so to others."
Harm includes violence and fraud. The key word is initiation. Violence should be defensive only.
For instance, drug prohibition violates the Zero Aggression Principle by initiating violence against adults who make unpopular choices. One merely needs to look no further than the ramifications of the 18th Amendment... and the fact that the 20th Amendment was passed to repeal it...
If you think you might be interested in the Zero Aggression Principle, take this quiz:
Let me know how it goes, comments please!