Vigilance Committees typically acted outside of the legal system and used extralegal methods, such as lynching, flogging, or forced expulsion, to punish those they deemed guilty of crimes. They often targeted groups that were perceived as a threat to the community, such as criminals, gamblers, prostitutes, or minority groups.
The most famous Vigilance Committee was probably the San Francisco Committee of Vigilance, which was formed in 1851 in response to lawlessness and corruption in the city. The committee took control of the city government, arrested and tried suspected criminals, and carried out its own punishments. The committee was disbanded in 1856 after it had restored order and confidence in the government.
Vigilance Committees were controversial, and their actions were sometimes criticized as vigilantism or mob rule. However, they also played a role in establishing law and order in frontier communities and shaping the development of the American West.