Collective punishment is a punishment or sanction imposed on a group or whole community for acts allegedly perpetrated by a member or some members of that group or area, which could be an ethnic or political group, or just the family, friends and neighbors of the perpetrator, as well as entire cities and communities where the perpetrator (s) allegedly committed the crime. Because individuals who are not responsible for the acts are targeted, collective punishment is not compatible with the basic principle of individual responsibility. The punished group may often have no direct association with the perpetrator other than living in the same area and can not be assumed to exercise control over the perpetrator's actions. Collective punishment is prohibited by treaty in both international and non-international armed conflicts, more specifically Common Article 33 of the Fourth Geneva Convention and Article 4 of the Additional Protocol II.[1][2]
Collective punishment was outlawed in 1949 by the Geneva Convention.