Frank Jellinek’s scientific contributions

... of the politics of fear is that of the 'dangerous classes' (Chevalier 1973;Melossi 2008;Standing 2011). ...

Reference:

A Fish Rots from the Head: How Powerful Moral Entrepreneurs Manufacture Folk Devils

... But to have them move out and disperse into the margins of the city beyond the reach of the state, with no fixed addresses and permanent homes and engaged in irregular work, was another. The migrating Chinese of the entrepôt became, as Louis Chevalier put it, its " dangerous classes " (Chevalier 1973). The urban kampongs were, to use Mary Douglas' term, a critical social and political " margin " in post-war Singapore. ...

Reference:

Black Areas: Urban Kampongs and Power Relations in Post-war Singapore Historiography