Battle of Century City, as police in Los Angeles attack some 500 janitors and their supporters during a peaceful Service Employees International Union demonstration against cleaning contractor ISS. The event generated public outrage that resulted in recognition of the workers' union and spurred the creation of an annual June 15 Justice for Janitors Day – 1990

The U.S. minimum wage increases to $3.80 per hour - 1990

The United Mine Workers of America dedicates the John L. Lewis Mining and Labor Museum at Lewis’ boyhood home in Lucas, Iowa - 1990