Villaplane then became Bonny's chauffeur and then, in 1944, head of one of the five sections of the North African Brigade, a criminal organisation made up of North African immigrants who collaborated with the Nazis through anti-Resistance activities. The fierce character of his recruits earned him the unflattering nickname of "SS Mohammed". He obtained both the rank and uniform of an SS-Untersturmführer. His section was put in charge of finding Resistance members and their supporters in the region of Périgueux in the month of March 1944, and then in the region of Eymet in the following month. It was in Eymet that he negotiated for the lives of hostages for money. On 11 June 1944, the day following the massacre at Oradour-sur-Glane, he had 52 people executed in Mussidan.