"At Riverside Church in Harlem on April 4, 1967, exactly one year before his assassination, Martin Luther King, Jr. delivered a blistering and sophisticated critique of U. S. intervention in Vietnam. His 'Beyond Vietnam' speech was prescient in ways that continue to haunt our society into the present day... King left the pulpit at Riverside to a standing ovation, but the reaction outside those church walls the next day was swift and scathing. Nearly 170 white and black newspapers across the country denounced him and the speech."
For more on King's in/famous speech, check out this article by Kristopher Burrell in Gotham: A Blog for Scholars of New York City History.