1 September - 22 September 1934
A strike in Woonsocket, RI, part of a national movement to obtain a minimum wage for textile workers, resulted in the deaths of three workers. Over 420,000 workers ultimately went on strike.

5 September 1917
Federal agents raided the IWW headquarters in 48 cities.

5 September 1882
Thirty thousand workers marched in the first Labor Day parade in New York City.

7 September 1916
Federal employees win the right to receive Worker's Compensation insurance.

10 September 1897
19 unarmed striking coal miners and mine workers were killed and 36 wounded by a posse organized by the Luzerne County sheriff for refusing to disperse near Lattimer, Pennsylvania. The strikers, most of who were shot in the back, were originally brought in as strike-breakers, but later organized themselves.

14 September 1959
The Landrum-Griffin Act passes, restricting union activity.

17 September 1989
Ninety-eight miners and a minister occupied the Pittston Coal Company's Moss 3 preparation plant in Carbo, Virginia, beginning a year-long strike against Pittston Coal. While a month-long Soviet coal strike dominated U.S. news broadcasts, the year-long Pittston strike garnered almost no mainstream press coverage whatsoever.

19 September 1919
Looting, rioting and sporadic violence broke out in downtown Boston and South Boston for days after 1,117 Boston policemen declared a work stoppage due to their thwarted attempts to affiliate with the American Federation of Labor. Massachusetts Governor Calvin Coolidge put down the strike by calling out the entire state militia.

21 September 1896
The state militia was sent to Leadville, Colorado to break a miner's strike.

22 September 1919
The "Great Steel Strike" began. Ultimately, 350,000 steel workers walked off their jobs to demand union recognition. The AFL Iron and Steel Organizing Committee called off the strike on 8 January 1920, their goals unmet.