The briefly studied the Frankfurt School at University but was turned off by what I considered the absurdity of the concept of "reification" - the idea that, but for a few exceptional thinkers who can point to the truth, we are all trapped in the world manipulated by capitalists.
The book has got some good reviews and has re-kindled my interest in the subject.
Lately I have been reading a few books from what you might call the extreme political left - particularly the field of so-called "critical theory"
And this is another
And finally, my lifelong interest in medieval manuscripts has another outlet