Those who initially objected to the involvement in Vietnam fell into three broad categories: people with left-wing political opinions who wanted an NLF victory; pacifists who opposed all wars; and liberals who believed that the best way of stopping the spread of communism was by encouraging democratic, rather than authoritarian governments.
The Tribunal, and other critics of the war, claimed that the US behaviour in Vietnam was comparable to the atrocities committed by the Nazis in Europe during the Second World War.
His actions inspired others and throughout America, Anti-Vietnam War groups organised meetings where large groups of young men