July 20
New York City newsboys, many so poor that they were sleeping in the streets, begin a two-week strike. Several rallies drew more than 5,000 newsboys, complete with charismatic speeches by strike leader Kid Blink, who was blind in one eye. The boys had to pay publishers up front for the newspapers; they were successful in forcing the publishers to buy back unsold papers - 1899
Two killed, 67 wounded in Minneapolis truckers' strike -- "Bloody Friday" - 1934
And this: July 20, 1934 - “Bloody Friday” in the Minneapolis Teamster truckers strike. Police began shooting pickets without provocation, killing two and wounding dozens more.
Postal unions, Postal Service sign first labor contract in the history of the federal government - 1971
Labor history found here:
http://www.unionist.com/today-in-labor-history & here:
http://www.workdayminnesota.org/index.php?history_9_07_20_2011