Doggett describes "Hey Jude" as a song that "glowed with optimism after a summer that had burned with anxiety and rage within the group and in the troubled world beyond". The single's release coincided with the violent subjugation of Vietnam War protestors at the Democratic National Convention in Chicago, and condemnation in the West of the Soviet-led invasion of Czechoslovakia and its crushing of attempts to introduce democratic reforms there. In this climate, Lennon's espousal of a pacifist agenda over violent confrontation in "Revolution" drew heavy criticism from New Left activists. By contrast, with its more universal message, "Hey Jude" was adopted as an anthem by Czech citizens in their struggle.