Prologue, August 29, 1968 lyrics

[Actual recording, Democratic Convention (Chicago, August 29, 1968). Black militants exhorting demonstrators: "God Give Us the Blood to Keep Going"; March begins; Police attempt to disperse marchers; Chant: "The Whole World's Watching."]

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What do you think is the meaning of Prologue, August 29, 1968 by Chicago?