As in all other Nazi concentration camps, not all the prisoners were equal. Their treatment depended largely on the category assigned to each inmate, as well as their nationality and rank within the system. The so-called kapos, or prisoners who had been recruited by their captors to police their fellow prisoners, were given more food and higher pay in the form of concentration camp coupons which could be exchanged for cigarettes in the canteen, as well as a separate room inside most barracks. On Himmler's order of June 1941, a brothel was opened in the Mauthausen and Gusen I camps in 1942. The Kapos formed the main part of the so-called "Prominents" (), or prisoners who were given a much better treatment than the average inmate.