In the U.S., CIA director Allen Dulles launches a program codenamed MK-ULTRA, which involves the surreptitious use of drugs such as LSD to manipulate individual mental states and to alter brain function. The specific goals of the program are multifold, but focus on drugging world leaders in order to discredit them, developing a truth serum, and making people highly susceptible to suggestion. All of this is top secret, and files relating to MK-ULTRA’s existence are destroyed in 1973, but the truth about the program still emerges in the mid-seventies after a congressional investigation.

U.S. President Franklin D. Roosevelt dies of a cerebral hemorrhage while sitting for a portrait in the White House. After a White House funeral on April 14, Roosevelt’s body is transported by train to his hometown of Hyde Park, New York, and on April 15 he is buried in the rose garden of the Roosevelt family home.

American journalist, playwright, and author Richard Harding Davis dies of a heart attack at home in Philadelphia. Not widely known now, Davis was one of the most important and influential war correspondents ever, establishing his reputation by reporting on the Spanish-American War, the Second Boer War, and World War I, as well as his general travels to exotic lands.

In Mexico, revolutionary leader Emiliano Zapata is shot dead by government forces in the state of Morelos, after a carefully planned ambush. Following the killing, Zapata’s revolutionary movement and his Liberation Army of the South slowly fall apart, but his political influence lasts in Mexico to the present day.

F. Scott Fitzgerald’s novel The Great Gatsby is published in New York City by Charles Scribner’s Sons. Though Gatsby is Fitzgerald’s best known book today, it was not a success upon publication, and at the time of his death in 1940, Fitzgerald was mostly forgotten as a writer and considered himself to be a failure.