I just reviewed my notes for The Bell Curve to make sure I hadn't mis-remembered the content. Out of 22 chapters, two are on race. One begins with, "The first thing to remember is that the differences among individuals are far greater than the differences between groups." In other words: knowing someone's race tells you nothing about their intelligence.
The chapters on race contain no expression of racial superiority or inferiority, nor any policies favoring discrimination. The only definition of racism that could apply is the view that there are some statistical differences between races, though the book doesn't weigh-in on how much is caused by genes vs environment. It also reiterates that these statistical differences cannot be used to infer anything about individuals.
Supporting racism (in the sense of advocating for racial superiority or discrimination) is deeply unethical, so I'd very much like to know if Murray holds such views.