Who the fuck is Collossus?

It seemed like a perfectly normal Sunday morning until Etienne Loobuyck is left for dead in his driveway. Loobuyck is close friends and business partner of mayor Vanhecke, who asks for the case to be prioritized. Who is the principal Colossus and where does this act of aggression come from? Is it linked to a rejected building permit? And why is Dorien, Vanhecke's wife, so upset?