 As a result, the Nazis identified and isolated "difficult individuals" who might alert the prisoners, and removed them from the mass – lest they incite revolt among the deceived majority of prisoners en route to the gas chambers.The "difficult" prisoners were led to a site out of view to be killed off discreetly.A prisoner "Sonderkommando" (Special Detachment) effected in the processes of extermination; they encouraged the Jews to undress without a hint of what was about to happen.