In addition to his writings, Marcy was one of the organizers of the first demonstration in the United States against the Vietnam War, a demonstration whose importance was noted by Ho Chi Minh in an interview published in the National Guardian newspaper.
In addition to his writings, Marcy was one of the organizers of the first demonstration in the United States against the Vietnam War. The demonstration, by WWP affiliate group Youth Against War and Fascism, occurred in August 1962 and was subsequently noted by Ho Chi Minh in an interview with the National Guardian newspaper.