Hard Hat Riot
The Hard Hat Riot was a riot which occurred on May 8, 1970, near the intersection of Wall Street and Broad Street and at New York City Hall. The riot occurred about noon when about 200 construction workers mobilized by the New York State AFL-CIO attacked about 1,000 high school and college students and others protesting the Kent State shootings, the American invasion of Cambodia and the Vietnam War. The riot lasted little more than two hours, and ended of its own accord. More than 70 people were injured, including four policemen. Six people were arrested.
It's also funny to think back to time when unions were anti-communist. But, somethings never change. Violence is still their calling card. All of the violence you have heard about at Tea Parties has been union violence or subversives.