Nazi concentration camp badge
The badges helped guards assign tasks to the prisoners. If a prisoner's badge marked them as an escape suspect, the SS would not allow them to work outside the camp fence. If a prisoner had an F on their badge (meaning they were French), guards could force them to help translate instructions to new prisoners from France. If a guard looked at a prisoner and saw a green badge, the guard knew right away that the person was a convicted criminal. Guards often assigned these "green triangles" to be kapos. These were prisoners who were assigned to help the SS run the camps. Many kapos used abuse and violence to control other prisoners.