Labor Wars

As labor unions and movements began to form and coalesce in the 19th century, the tensions between workers and companies led to demonstrations, encounters, and even conflicts that descended into violence. Among those, few were as notorious as the fight that took place on April 20, 1914 at Ludlow in the Southern Colorado coalfields between the Colorado National Guard and striking miners at a United Mine Workers camp. In the previous several decades, there had been a number of violent incidents during strikes, but in 1914, the Ludlow tragedy deeply shocked the nation.

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.