Video: 'Conservative Counterrevolution: Hard Hat Riots and Attica'

(Friday, May 8, 1970, 11:55 a.m. EDT; during the Cambodian Campaign, part of the Vietnam War, Cambodian Civil War, Indochina Wars and the Cold War) — A group of 200 construction workers, mobilized by the New York State AFL-CIO, attacked a group of some 1,000 college and high school students and others protesting the Vietnam War today outside of New York City Hall, near the intersection of Wall Street and Broad Street.

Video: 'Nixon 'Tricky Dicky' Part 2 of 3' (Hard Hat Riot at 33:32)

The riot, first breaking out near the intersection of Wall Street and Broad Street in Lower Manhattan, soon spilled into New York City Hall, and lasted approximately two hours.

Video: 'Vietnam: A Television History - Homefront USA [10/11]' (Hard Hat Riot at 47:07)

More than 70 people, including four policemen, were injured on what became known as “Bloody Friday.”

Video: 'Our World Spring 1970 Part 1' (Hard Hat Riot at 2:28)

Six people were arrested.