What did they have against J. Adams?
Do you have a reference for this claim? I've never seen it before and find it intriguing. Especially since being a French citizen, at least before the French Revolution, meant owing allegiance to Louis XVI.
It wasn't before the French Revolution. A lot of it came about during and through the French Revolution.
I don't have the references for Thomas Jefferson handy at the moment. I'm sure it wouldn't be that hard to track something down, as there's a lot of discussion about that one on the internet.
As for George Washington and James Madison, I gave references in the first post I made on them:
http://www.freerepublic.com/focus/bloggers/2994252/posts?page=103#103
Interestingly, the 1825 book that I reference discusses owing allegiance, at least in the case of Thomas Paine, who was the main topic of discussion. It says yes, he had allegiance to France, but that was subservient to his allegiance to the United States.