hey Rudeboy666, Crass were one of the 'political' groups, yes, but to a first wave Punk Rocker like me, unimportant. But now the revisionist history of Punk Rock is being rewritten by everyone, it's assumed politics was fundamentally important to Punk Rock.
That's why people like Hell were authentic to me; they still cannot be categorised other than as a marker post in history-the moment they rose to signficance and made an impact.
Th Clash ? Music ? Well, I'm biased as I think they really helped take 'Punk Rock' into the cliched Politics of 'Punk'...also, musically they never turned me on- grey, studied, over-reliant on the mythologising of reggae. However, they became the most popular 'classic'/'original' Punk group ever didn't they , doing very well in the States. Difficult to say if music itself is political, but their stance of rebel-rock has proved very saleable over the years...but Alex Cox likes them and he is up there in my book, so gruding respect is posibly the best you'll get from me.