March 23, 1970 - President Richard Nixon declared a national emergency and ordered 30,000 troops to New York City to break the first nationwide postal strike.

For more information on the Great Postal Strike
Visit the American Postal Workers Union website, http://www.apwu.org/about/history.htm and the National Association of Letter Carriers website, http://www.nalc.org/nalc/facthist/index.html