After the Baltimore & Ohio Railroad imposed another wage cut, railroad workers in Martinsburg, West Virginia stopped trains on 1877-07-14, igniting the first major labor conflict to spread across multiple U.S. states and prompting state and federal troop interventions.
Railroad workers affiliated with the Knights of Labor launched a major walkout against Jay Gould’s rail lines, beginning 1886-03-01 and spreading across multiple states in a major test of late-19th-century railroad labor power.
At an eight-hour-day labor demonstration in Chicago’s Haymarket Square on 1886-05-04, a bomb was thrown and police fired into the crowd, killing and injuring civilians and officers; the incident fueled a national backlash against labor radicals and immigrants.
A major steel labor conflict at Carnegie Steel’s Homestead works began 1892-07-01, escalating into armed clashes (including a battle with Pinkerton agents) and becoming a defining episode in U.S. industrial union defeats of the era.
In 1892-07-01 (month known), a miners’ strike in Idaho’s Coeur d’Alene district turned violent and led to martial-law-style repression, helping spur the later formation and growth of Western hardrock miners’ industrial unionism.
Workers at the Pullman Company launched a strike on 1894-05-11 over wages and rents; the conflict expanded via the American Railway Union boycott and ended after a federal injunction and deployment of U.S. troops.
On 1897-09-10, a sheriff’s posse shot unarmed immigrant anthracite miners marching near Lattimer, Pennsylvania, killing at least 19; the killings became a turning point in organizing momentum for the United Mine Workers.
The United Mine Workers began the anthracite coal strike on 1902-05-12, demanding better wages and hours and union recognition; it became notable for being settled through federal arbitration after national pressure over fuel shortages.
In 1909-11-01 (month known), thousands of mostly immigrant garment workers—often called the “Uprising of the 20,000”—walked out in New York City, helping build the ILGWU and pushing workplace reforms in the garment industry.
Textile workers in Lawrence, Massachusetts began striking on 1912-01-11 after reduced pay tied to shorter hours; led by the IWW, the multiethnic strike drew national attention and won wage increases and related concessions.
During the Colorado coalfield strike, an attack on the Ludlow tent colony on 1914-04-20 by the Colorado National Guard and company-aligned forces killed dozens (including children), intensifying national scrutiny of industrial violence and labor conditions.
On 1919-02-06, about 65,000 workers in Seattle launched a citywide general strike in solidarity with shipyard workers, becoming a landmark event in U.S. labor history and a flashpoint for post–World War I anti-radical fears.
A nationwide steelworkers’ organizing drive culminated in a major strike beginning 1919-09-22, involving hundreds of thousands; it was defeated amid employer resistance and Red Scare repression, shaping labor strategy in heavy industry for years.
Armed coal miners and anti-union forces clashed at Blair Mountain starting 1921-08-25, in the largest labor uprising in U.S. history; federal intervention helped end the fighting and accelerated legal and political crackdowns on mine unions.
During a nationwide coal strike, violence in Herrin, Illinois on 1922-06-21 led to the killing of strikebreakers and others over June 21–22, highlighting the extreme volatility of labor disputes in coal communities in the 1920s.
On 1932-07-28, the U.S. Army was ordered to remove Bonus Marchers—World War I veterans demanding early bonus payments—from Washington, D.C., an episode that intersected mass unemployment politics with protest tactics and federal force.
West Coast longshore workers walked out on 1934-05-09, escalating into port shutdowns and intense confrontations; the dispute helped reshape maritime unionism and led to major changes in hiring halls and labor power on the docks.
Auto workers began occupying General Motors plants in Flint, Michigan on 1936-12-30, pioneering the sit-down tactic on a massive scale and forcing GM to recognize the United Auto Workers, accelerating industrial union growth.
After U.S. Steel signed with SWOC earlier in 1937, “Little Steel” firms refused; the CIO-led strike began 1937-05-26, producing some of the period’s most violent confrontations and delaying broad union recognition in parts of steel.
On 1937-05-30, Chicago police fired on unarmed steelworker demonstrators and supporters near Republic Steel, killing 10 and wounding many; the event became an enduring symbol of state violence during organizing drives in the 1930s.
Major Industrial Labor Conflicts and Strikes (1877–1937)
