May 7

The Knights of St. Crispin union is formed at a secret meeting in Milwaukee. It grew to 50,000 members before being crushed by employers later that year - 1867
 
Two die, 20 are injured in “BloodyTuesday” as strikebreakers attempt to run San Francisco streetcars during a strike by operators. The strike was declared lost in 1908 after many more deaths, including several in scab-operated streetcar accidents - 1907
 
Philadelphia’s longest transit strike ends after 44 days. A key issue in the fight was the hiring and use of part-timers - 1977

More info & ammo for unionists is available
online from Union Communication Services.

http://www.unionist.com/