Holleeder had plans for the liquidation of eight people before he was arrested in 2015. That is what his sister Astrid declared to the police. Among them crime leaders Danny K. and Dino S., crime reporter Peter R. de Vries and his own sister Sonja, as well as the prominent Hells Angel Harrie S.and Maruf M., a Bosnian who was regularly seen with Holleeder between 2000 and 2006.