Traditionally, the mayor has an important role as a citizen’s father and as a maintainer of public order. In the context of the so-called ‘undermining’ criminality, the mayor has been increasingly empowered with new legal instruments to combat undermining criminality. Some mayors see themselves as a sheriff. However, in the Dutch Municipal Act, the mayor only has a task of maintaining the public order. How does this task relate to combating undermining criminality? What is the role of the mayor in the combat of undermining criminality? Nowadays, there is no legal basis in the Dutch Municipal Act to equip the mayor with crime-fighting duties. This article proposes to equip the mayor with a legal duty as a crime fighter.