The Poor Peoples March began in Washington D.C. less than a month after the murder of Martin Luther King Jr.
Only nine of the men working in the mine at the time of the disaster were able to escape, after one of them got to safety and returned with a rescue team and equipment.
On the orders of President Roosevelt, the U.S. Army seized the Chicago headquarters of the unionized Montgomery Ward & Co. after management twice defied the NLRB.
The workers were protesting at the South Carolina Medical College Hospital demanding wage increases and union recognition.
The Irish Republican Brotherhood launched the "Easter Rebellion," an armed uprising against oppressive British rule.
The Oklahoma explosion (caused by a detonated truck bomb) took 168 lives including 19 children, and injured 680 people.
Today marks the 75th anniversary of Superman's first appearance in DC's Action Comics No. 1, published April 18, 1938.
Randolph played a leading role in the fight for civil and labor rights, from the 1930s through the 1960s.
She is best known for having written the folk song "Which Side Are You On?," which she wrote at the age of twelve while her father was out on strike with other coal miners.
Today in 2006, tens of thousands of immigrants demonstrated in 100 U.S. cities in a national day of action billed as a campaign for immigrants' dignity.