I'd say the Prologue, "Against School", and first chapter, "Everything You Know About School is Wrong", in Gatto's
Weapons of Mass Instruction, are a pretty good place to start. There you'll find historical links to the model of education in Prussia, and references to this model by many influential American academics, politicians, industrialists and writers, such as Horace Mann, James Bryant Conant, Alexander Ingliss, and William Torrey Harris. There's a good number of quotes and sources to published material. He also refers to a book entitled
True and Only Heaven by Christopher Lasch, which he says refers to the crtitical days of school history, and Orestes Brownson who contested school policy in the 1840s in New England as "a munumental conspiracy." I haven't read Lasch's book myself. You might also be interested in some of the historic influences on "Progressive" education, for example Herbert Spencer, who is discussed alot in
Getting in Wrong from the Beginning by Kieran Egan - I read the introduction
here, and I don't know if the author mentions the Sudbury model in the body of the book, but it sounds to me like he has never come across it. Perhaps that's not really within the scope of his enquiry.
The other thing to bear in mind is that the establishment of compulsory school followed similar patterns throughout the then industrialising world. What happened in the US was not dissimilar to what happened in England, or even here in Sweden. One common theme was a two-tier system, where the rich elite or aristocrats of some societies were offered a "free" or liberal education, while the masses were drilled into submissive, meaningless and repetitive routines specifically to make them withstand operating machinery for hours at a time, and also to become a timid, stupefied populace that could be easily managed.
Jim.