Perhaps Andy Ngo's book, "Unmasked: Inside Antifa's Radical Plan to Destroy Democracy," has been mentioned elsewhere, but I have read it and I can't say enough good about it. We already have a good grasp of what Antifa is about, but Ngo's inside look is downright unnerving. They are very far along in their planning. Reading Ngo's book will bring home the adage of not underestimating one's adversary.