John Wilkes Booth (Goodrich, 2005)

Scholarship
Thomas Goodrich, The Darkest Dawn: Lincoln, Booth, and the Great American Tragedy (Bloomington: Indiana University Press, 2005), 60-61.
Although [John] Wilkes [Booth] was an outspoken advocate of Southern rights, other siblings in the Booth family were either neutral or, as was the case with older brother Edwin, strongly pro-Union.