I discovered this on Spotify’s “A Poem a Day” for every day of Black History Month.

From the Folkways site: Recorded on February 20, 1966, in New York City, the Read-In for Peace in Vietnam was a cultural event aimed not only at registering dissent against the American war in Vietnam, but also at “bearing witness to the viability of the American conscience.” The evening featured 29 writers and artists performing works relevant to the anti-war effort. Most notably, the roster of speakers included such giants of 20th-century American writing as Susan Sontag, Robert Lowell, Arthur Miller, and William Styron. The album of the event, released in 1967, contains representative excerpts from each speaker in order to convey the “essential mood or message” of the event. Liner notes offer a brief introduction to the record, as well as a transcript of the readings included on the album.