Political sociology - theoretical, looking at political mobilization.
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But one can claim that it IS better understood that way and the definition should reflect that.
- I'd been wound up by some other sociologist making exactly the same claim about the word racism! 
But regardless of that point about conceptual exclusion, it doesn't follow anyway. It's entirely possible to think that "racism" is best understood as a very general term to denote racially motivated bigotry, etc., and to accept the points you're making.