Opposition to the war within South Vietnam was demonstrated most dramatically by Buddhist monks, but students and academics also protested.
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E.1.c. South Vietnam - Buddhists
Includes helpful information on the Buddhist resistance in 1963, see especially pp. 194-243 in original edition.
Account of the 1963 Buddhist revolt, its origins and aftermath. See also later article by Roberts assessing the political potential of the Buddhists: Roberts, Adam , The Buddhists, the War and the Vietcong World Today, 1966, pp. 214-222 . Both articles now available online: http://www.jstor.org (but only via contributing libraries).
Well known theorist of nonviolence puts the Buddhist case.