It sometimes happens that that the workers themselves give themselves over to racism. This happens when, threatened with massive unemployment, they attempt to concentrate it on certain groups: Italians, Poles or other “filthy foreigners,” “dirty Arabs,” “[insert slur here],” etc. But in the proletariat these impulses only occur at the worst moments of demoralization, and don’t last. As soon as he enters into struggle the proletariat clearly and concretely sees its enemy: it is a homogeneous class with an historical perspective and mission.

On the contrary, the petit bourgeois is a class condemned. At the same time it is also condemned to be unable to understand anything, to be incapable of fighting: it can do nothing but […] flail about in the vice that crushes it. Racism is not an aberration of the spirit: it is and will be the petit bourgeois reaction to the pressures of big capital. The choice of a “race,” that is of the group upon whom the destruction will be concentrated, obviously depends on the circumstances.

— Amadeo Bordiga