This song by John Marshall came from London Weekend Television "All You Need Is Love - The Story of Popular Music" by one Tony Palmer.
John was in part 11 (of 17 episodes - fully 15 hours of archive and contemporary footage.)
Episode 15 - "Go Down, Moses!: Songs of War and Protest" narrated by the BBC's Charles Chilton
Clips: "My Country, 'Tis of Thee", "Yankee Doodle", "Dixie", Presidential Campaign of 1840, "Land of Hope and Glory", Songs of Freedom, "The Battle Hymn of Lt. Calley", "The Killers That Run the Other Countries", Hollywood blacklist, People's Songs, Hootenanny (US TV series)
Artists: Leonard Cohen, Pete Seeger, Arlo Guthrie, Vera Brodsky Lawrence, Yip Harburg, Bing Crosby, Glenn Miller, Vera Lynn, The Andrews Sisters, Woody Guthrie, The Weavers, Bob Dylan, The Kingston Trio, Peter, Paul and Mary, Leon Rosselson, Joan Baez, Country Joe McDonald, John Marshall, James Simmons, Ireland's Freemen.