“In the Year of the Pig is a 1968 American documentary film about the origins of the Vietnam War, directed by Emile de Antonio. It was nominated for an Academy award for best documentary.
The film, which is in black and white, contains much historical footage and many interviews. Those interviewed include Harry Ashmore, Daniel Berrigan, Philippe Devillers, David Halberstam, Roger Hilsman, Jean Lacouture, Kenneth P. Landon, Thruston B. Morton, Paul Mus, Charlton Osburn, Harrison Salisbury, Ilya Todd, John Toller, David K. Tuck, David Werfel and John White.
Produced during the Vietnam War, the film was greeted with hostility by many audiences, with bomb threats and vandalism directed at theaters that showed it.
De Antonio cites the film as his personal favorite. It features the ironic use of patriotic music, portrays Ho Chi Minh as a patriot to the Vietnamese people, and asserts that Vietnam was always a single country rather than two.
From the Wikipedia article, linked here.