Knights of Labor: This term refers to an influential labor organization in the late 19th century that sought to unite all workers regardless of skill level or race.
Haymarket Affair: It was an incident in 1886 where violence erupted during a labor rally in Chicago after someone threw a bomb into a crowd of police officers.
Homestead Strike: This term describes a violent labor dispute in 1892 between workers and the Carnegie Steel Company in Homestead, Pennsylvania.