Vigilantes

Vigilantes are people who voluntarily carry out duties usually done by heroes without paying attention to the law. Due to the hero regulations people are not allowed to carry heroic duties out and vigilantism is therefore forbidden.

History
According to All Might the origins of heroes can be traced back to the vigilantes. When Quirks started to manifest there was no organization that controlled the Pro Heroes and they were therefore Vigilantes. Nowadays most of the vigilantes have vanished.