That's the title of the embedded video below.
One thing the Founding Fathers didn't like about Quakers was their reluctance to take up arms against the British.
Other than that the Quakers represented a sort of "reductio ad absurdum" of Protestantism -- a "Protestantism on steroids" as my friend Mark David Hall has termed it -- that America's Founders really dug.
The Quakers didn't take communion because they didn't believe in sacraments. Hell, they didn't believe in ministers. The notion of priesthood of the believer was taken to its ultimate logical conclusion by having no minister or "pastor" preaching or dictating to the flock.
Though one distinctive thing on the Quakers to keep in mind regarding their place in the Enlightenment: Their honoring of and placing the "Spirit" as central to their faith made them more mystical and less "rationalistic" in the ideal.