American Labor

In early 1968 the grisly on-the-job deaths of two African-American sanitation workers in Memphis, Tennessee, prompted an extended strike by that city's segregated force of trash collectors. Workers sought union protection, higher wages, improved safety, and the integration of their work force. Their work stoppage became a part of the larger civil rights movement and drew an impressive array of national movement leaders to Memphis, including, on more than one occasion, Dr. Martin Luther King, Jr. King added his voice to the struggle in what became the final speech of his life.

Although it's no longer well known as a flashpoint, few things were as controversial during the late 19th century as the Haymarket Affair. Depending on one's perspective, the riots and the violence that ensued were the result of anarchist terrorists attacking law enforcement authorities with a homemade bomb that was detonated during a large public event, killing a police officer and wounding several more.