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 “Bloody Tuesday” 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 
(From Blackjacks to Briefcases: This is the first book to document the systematic and extensive use by American corporations of professional unionbusters, an ugly profession that surfaced after the Civil War and has grown bolder and more sophisticated with the passage of time. Since the 1980s, hundreds of firms have paid out millions of dollars to hired thugs. Some have been in uniforms and carried nightsticks and guns, others have worn three-piece suits and carried attaché cases, but all had one simple mission: to break the backs of workers struggling for decency and fair treatment on the job.)
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.
New York Times Tech Guild Ends Strike, Continues Contract Fight
ZeniMax Video Game Workers Walk Off the Job in Maryland and Texas
