 Among the writings, speeches, poems, songs and other sources included in the book are selections by Chief Joseph, Frederick Douglass, Henry David Thoreau, John Brown, Mary Harris "Mother" Jones, Upton Sinclair, Emma Goldman, Joe Hill, Eugene V. Debs, Langston Hughes, John Steinbeck, Malcolm X, Alice Walker, Martin Luther King, Jr., Allen Ginsberg, Assata Shakur, Angela Davis, Leonard Peltier, Noam Chomsky, César Chávez, Abbie Hoffman, Mumia Abu-Jamal, Julia Butterfly Hill and many others.In 2009, the documentary film "The People Speak" was released.Narrated by Zinn, the film uses dramatic and musical performances of the letters, diaries, and speeches of everyday Americans, based on Zinn's "Voices of a People's History of the United States".