April 3rd

Panama Papers published - 11.5 million confidential documents from offshore law firm Mossack Fonseca expose widespread illegal activities including fraud, kleptocracy, tax evasion and the violation of international sanctions by the world's elite in the world's largest ever data leak.
Panama Papers
A Vietnamese immigrant opened fire in an immigrant community center in Binghamton, N.Y., killing 13 people before taking his own life.
Binghamton shootings
Former Liberian President Charles Taylor pleaded not guilty before an international war crimes tribunal in Sierra Leone.
Surrounded by police, five suspects in the Madrid railway bombings blew themselves up in a building outside the Spanish capital, also killing a special forces agent.
A federal judge ruled that Microsoft Corp. had violated U.S. antitrust laws.
United States v. Microsoft Corp.
The Dow Jones industrial average climbed above 9,000 for the first time.
Closing milestones of the Dow Jones Industrial Average
The Unabomber, Ted Kaczynski, is arrested. The mathematician who was driven by anarchist ideas sent out 16 letter bombs between 1978 and 1995, killing 3 people and injuring 23.
Ted Kaczynski
The first public mobile telephone call is placed on a Manhattan sidewalk. Motorola's Martin Cooper called Joel Engel of Bell Labs. He later told the BBC that his first words were “Joel, I'm calling you from a 'real' cellular telephone. A portable handheld telephone.”
History of mobile phones
Civil rights leader Martin Luther King Jr. delivered his "mountaintop" speech to a rally of striking sanitation workers in Memphis, Tenn., less than 24 hours before he was assassinated.
I've Been to the Mountaintop
Harry S. Truman signs the Marshall Plan. $12.4 billion were allocated to help rebuild European economies after the end of World War II and prevent communists from seizing control.
Marshall Plan
Soviet troops massacre about 22,000 Polish nationals. The Katyn massacre is considered the worst massacre of prisoners of war in history. The order to execute all captive members of the Polish Officer Corps was signed by Joseph Stalin.
Katyn massacre
Bruno Hauptmann was electrocuted in Trenton, N.J., for the kidnap-murder of the Lindbergh baby.
Richard Hauptmann
Actor Marlon Brando was born in Omaha, Neb.
Marlon Brando
Joseph Stalin appointed General Secretary of the Russian Communist Party by Vladimir Lenin.
Joseph Stalin
Gottlieb Daimler patents his engine design. The German engineer's so-called “grandfather clock engine” was lighter than previous four-stroke engines and is considered a milestone for the invention of the automobile.
Gottlieb Daimler
Outlaw Jesse James was shot to death in St. Joseph, Mo., by Robert Ford, a member of his gang.
Robert Ford (outlaw)
Union forces occupied the Confederate capital of Richmond, Va.
Richmond in the American Civil War
The Pony Express began service between St. Joseph, Mo., and Sacramento, Calif.
Pony Express
Author Washington Irving was born in New York City.
Washington Irving
English Long Parliament passes the Self-Denying Ordinance, limiting regional armies, significant step toward New Model Army.
Self-denying Ordinance