@Frank Apisa,
There is a chance that vengeance may be personal, but may be outside the law.
Justice is always a societal process. Break one of society's laws, and justice is when the lawbreaker is punished accordingly.
A drug mule smuggles cocaine through customs, but then sells it and pockets the cash.
The drug baron who employed the mule finds him, strings him up and does dastardly things to him until he snuffs it.
Justice? I don't think so. Definitely vengeance, and nothing to do with the process of law.