From the court records of United States v. Vincent Raymond Dunne and Grant Dunne, the note for this photo states: "Trotsky posed with American Trotskyites Harry De Boer and James H. Bartlett and their spouses; print autographed by Trotsky, April 5, 1940."

Born on January 15, 1929, Martin Luther King, Jr. was a key leader of the civil rights movement of the 1950s and 1960s in the United States. President Lyndon B. Johnson issued this proclamation for a national day of mourning after King was assasinated on April 4, 1968.