There's no ground truth. :) They were written under a common psuedonym.
Couldn't works known to be written by hypothesis authors be used to train a supervised classifier?
That thought crossed my mind. I was thinking of trying to get a training set and teaching these models based on previous works by Jay, Madison, and Hamilton. However a lot of what I found for each of them was behind a paywall, or too hard to grep through to actually get the data. For instance all I could find in my (admittedly superficial) digging on John Jay was a book by UVA called "The Selected Papers of John Jay". It costs $90 and contains correspondence both too and from John Jay. It seemed like too much overhead for a weekend project so I just settled on unsupervised.