In the late 1960s and early 1970s, opposition to the war in Vietnam had grown to a huge mass movement.
This piece of remnant graffiti promoting the cause still exists (as of yesterday!) in the railway underpass at Arncliffe in Sydney. I wonder if there is any elsewhere?
The Moratorium against the Vietnam War began in the United States, with the first Moratorium march on 15 October, 1969. This followed anti-war marches on the United Nations and Pentagon in 1967. On 15 November, 1969, 500,000 people marched on Washington DC.
In Australia the first marches took place on 8 and 9 May, 1970. Over 200,000 people took part, 100 000 in Melbourne. It was the largest mass movement against the war to that time. The second was in September 1970 and the third in July 1971. By this time, public opinion was turning decisively against conscription and Australia's involvement in the war.