Jeremy Stangroom

There's never been any other relevant kind. Any derisive mention of identity politics reveals naïveté (or intentional misdirection).

Just isn't true. Check out Gramsci's idea of a hegemonic project, for example. Or have a look at the work of Stuart Hall and Martin Jacques.

I admit I'm not familiar with it; was it politically relevant and separate from sentiments of belonging to a group?

It's basically a model for constructing a political movement that has some chance of overturning capitalism. It's anti-reductionist,

To be clear, I was referring to relevance in practice, as something successful in actual politics. Obviously there are other ways in theory.