First book off my shelf, to recommend on this story, would be Hadjou/THE TEN-CENT PLAGUE - the Great Comic -Book Scare and How it Changed America. Gives a lot of testimony.
And, if one could find/afford them, ALTER EGO, whole numbers 123-128 (#128 also has an article on Wertham and SEDUCTION OF THE INNOCENT), 130, 133-136, 138. I think that was the totality of the articles, but I could be wrong. It gives a lot of facts, and the 'zine adds a lot of pictorial examples. Or you could go for the whole book ( SEAL OF APPROVAL: THE HISTORY OF THE COMICS CODE), but I don’t know if you would get the illustrations.